| 1 | Science | 744 | 106.1K | 484 | 293 |
| 2 | Geophysics | 1,213 | 64.8K | 67 | 50 |
| 3 | Biology | 364 | 55.5K | 874 | 534 |
| 4 | Physics | 267 | 46.9K | 1396 | 687 |
| 5 | Meteorology | 568 | 43.9K | 56 | 39 |
| 6 | Natural history | 158 | 41.4K | 392 | 358 |
| 7 | Atmospheric Physics | 611 | 34.0K | 32 | 35 |
| 8 | Pollution | 545 | 32.3K | 140 | 153 |
| 9 | Ecology | 489 | 27.3K | 327 | 362 |
| 10 | Environmental Health | 359 | 27.1K | 209 | 137 |
| 11 | Atmospheric Chemistry | 359 | 24.0K | 34 | 40 |
| 12 | Climatology | 245 | 23.4K | 85 | 41 |
| 13 | Marine Biology | 481 | 22.8K | 35 | 31 |
| 14 | Oceanography | 514 | 22.2K | 35 | 43 |
| 15 | Planets | 376 | 22.0K | 82 | 65 |
| 16 | Environment | 216 | 19.5K | 401 | 314 |
| 17 | Fisheries | 742 | 19.3K | 7 | 8 |
| 18 | Earth Sciences | 143 | 19.3K | 300 | 76 |
| 19 | environmental pollution | 351 | 17.2K | 139 | 127 |
| 20 | Medicine | 304 | 16.7K | 1090 | 916 |
| 21 | Research | 289 | 16.3K | 848 | 546 |
| 22 | Toxicology | 184 | 10.9K | 442 | 253 |
| 23 | Environmental Engineering | 150 | 10.3K | 299 | 235 |
| 24 | sanitation | 120 | 9.1K | 131 | 147 |
| 25 | Hydrology | 248 | 8.0K | 83 | 125 |
| 26 | Environmental pollutants | 153 | 7.8K | 60 | 33 |
| 27 | pollutants | 149 | 7.6K | 48 | 28 |
| 28 | Environmental Chemistry | 150 | 7.5K | 67 | 151 |
| 29 | Water pollution | 184 | 7.2K | 108 | 186 |
| 30 | Biodiversity conservation | 98 | 7.0K | 157 | 221 |
| 31 | Algal blooms | 68 | 6.6K | 7 | 5 |
| 31 | Cyanobacteria | 68 | 6.6K | 7 | 5 |
| 31 | microalgae | 68 | 6.6K | 7 | 5 |
| 34 | environmental protection | 68 | 6.5K | 493 | 161 |
| 35 | atmospheric models | 133 | 6.1K | 36 | 58 |
| 36 | Biodiversity | 100 | 5.8K | 175 | 153 |
| 37 | Data Mining | 26 | 5.8K | 351 | 67 |
| 37 | data collection | 26 | 5.8K | 180 | 42 |
| 39 | Climate change | 63 | 5.5K | 121 | 215 |
| 39 | Eutrophication | 63 | 5.5K | 116 | 213 |
| 41 | Great Lakes | 165 | 5.4K | 11 | 11 |
| 42 | Estuaries | 76 | 5.0K | 4 | 5 |
| 43 | Marine Pollution | 123 | 4.9K | 23 | 35 |
| 44 | Environmental monitoring | 94 | 4.7K | 457 | 393 |
| 45 | United States | 231 | 4.7K | 391 | 526 |
| 46 | Biogeochemical cycles | 58 | 4.7K | 29 | 36 |
| 47 | Fishery management | 204 | 4.6K | 10 | 15 |
| 48 | Geology | 109 | 4.6K | 561 | 429 |
| 49 | Chemistry | 68 | 4.5K | 3130 | 2293 |
| 50 | Agriculture | 77 | 4.4K | 265 | 157 |
| 51 | Environmental Policy | 45 | 4.2K | 722 | 407 |
| 52 | Microbiology | 60 | 4.1K | 1970 | 1544 |
| 53 | Climate | 62 | 4.1K | 13 | 13 |
| 54 | air | 58 | 4.0K | 7 | 8 |
| 55 | Environmental Toxicology | 75 | 4.0K | 213 | 207 |
| 56 | Aquatic ecology | 146 | 3.9K | 8 | 10 |
| 57 | Water | 87 | 3.6K | 325 | 450 |
| 58 | Biogeochemistry | 54 | 3.4K | 195 | 188 |
| 59 | Zoology | 76 | 3.3K | 402 | 240 |
| 60 | ecosystem | 57 | 3.3K | 145 | 162 |
| 61 | Marine Meteorology | 59 | 3.2K | 64 | 52 |
| 62 | Genetics | 41 | 3.1K | 1258 | 1080 |
| 63 | Astrophysics | 103 | 3.1K | 913 | 1115 |
| 64 | Spectrum analysis | 60 | 2.9K | 1293 | 1102 |
| 65 | Microbial Ecology | 50 | 2.8K | 526 | 566 |
| 66 | Evolution | 37 | 2.7K | 521 | 436 |
| 67 | Aerosols | 41 | 2.7K | 102 | 41 |
| 68 | Coral reef biology | 34 | 2.7K | 39 | 16 |
| 69 | biological evolution | 37 | 2.6K | 600 | 556 |
| 70 | Geochemistry | 43 | 2.5K | 638 | 492 |
| 71 | Conservation Biology | 51 | 2.5K | 140 | 153 |
| 72 | Optics | 136 | 2.4K | 893 | 801 |
| 73 | Astronomy | 40 | 2.4K | 1180 | 996 |
| 74 | Molecular Biology | 59 | 2.4K | 2664 | 2728 |
| 75 | atmosphere | 48 | 2.4K | 73 | 41 |
| 76 | Transport | 69 | 2.3K | 18 | 37 |
| 76 | Sea | 69 | 2.3K | 16 | 26 |
| 76 | Fishery resources | 69 | 2.3K | 18 | 30 |
| 79 | Energy Policy | 9 | 2.2K | 1793 | 537 |
| 80 | Aquaculture | 88 | 2.2K | 155 | 211 |
| 81 | Marine mammals | 77 | 2.1K | 11 | 15 |
| 82 | Environmental Management | 59 | 1.8K | 433 | 674 |
| 83 | Marine Ecology | 86 | 1.8K | 23 | 39 |
| 84 | Wildlife conservation | 35 | 1.6K | 270 | 281 |
| 85 | Molecular ecology | 43 | 1.6K | 206 | 351 |
| 86 | Solar System | 56 | 1.6K | 188 | 228 |
| 87 | space environment | 40 | 1.5K | 35 | 22 |
| 88 | Mass Spectrometry | 10 | 1.5K | 755 | 204 |
| 89 | Coastal zone management | 65 | 1.5K | 9 | 30 |
| 90 | Invertebrates | 45 | 1.5K | 49 | 45 |
| 91 | Ocean Engineering | 41 | 1.5K | 401 | 334 |
| 92 | Population Genetics | 50 | 1.4K | 205 | 369 |
| 93 | Hydrometeorology | 4 | 1.4K | 215 | 61 |
| 94 | Sun | 47 | 1.4K | 97 | 116 |
| 95 | optical instruments | 15 | 1.3K | 166 | 71 |
| 96 | polar regions | 36 | 1.3K | 100 | 65 |
| 97 | weather forecasting | 43 | 1.3K | 19 | 26 |
| 98 | Geography | 34 | 1.3K | 679 | 526 |
| 99 | Systems Biology | 10 | 1.3K | 979 | 236 |
| 100 | Chemical Oceanography | 29 | 1.3K | 61 | 89 |
| 101 | Molecular Genetics | 36 | 1.3K | 506 | 642 |
| 102 | Meteorites | 13 | 1.3K | 591 | 434 |
| 103 | Mathematics | 20 | 1.3K | 3388 | 1381 |
| 104 | Technology | 33 | 1.2K | 1446 | 1026 |
| 105 | Atmospheric Science | 25 | 1.2K | 20 | 12 |
| 106 | Pharmacology | 11 | 1.2K | 3804 | 2060 |
| 107 | energy resources | 8 | 1.2K | 908 | 510 |
| 108 | water supply | 28 | 1.1K | 274 | 304 |
| 109 | Natural resources | 11 | 1.1K | 378 | 160 |
| 110 | Engineering | 10 | 1.1K | 3244 | 876 |
| 111 | Algae | 23 | 1.1K | 231 | 163 |
| 112 | Nuclear Energy | 5 | 1.1K | 1011 | 167 |
| 112 | weather | 20 | 1.1K | 88 | 53 |
| 114 | Public Policy | 1 | 1.0K | 3481 | 400 |
| 114 | power plants | 1 | 1.0K | 25 | 7 |
| 116 | Analytical Chemistry | 36 | 944 | 1715 | 1804 |
| 117 | Geomorphology | 15 | 909 | 647 | 468 |
| 118 | natural disasters | 28 | 878 | 248 | 290 |
| 119 | Genomics | 19 | 875 | 1567 | 1315 |
| 120 | China | 18 | 874 | 1303 | 666 |
| 121 | Seaweed | 20 | 873 | 168 | 158 |
| 122 | Molecular Spectroscopy | 17 | 860 | 756 | 352 |
| 123 | mammals | 8 | 859 | 733 | 198 |
| 124 | Botany | 36 | 848 | 1489 | 1809 |
| 125 | hazard mitigation | 22 | 816 | 169 | 151 |
| 126 | Risk assessment | 4 | 798 | 568 | 28 |
| 126 | Health Risk Assessment | 4 | 798 | 395 | 15 |
| 128 | Animal Behavior | 17 | 797 | 858 | 847 |
| 129 | ecological risk assessment | 3 | 789 | 269 | 9 |
| 130 | Geodesy | 19 | 763 | 171 | 101 |
| 131 | Marine resources | 31 | 741 | 67 | 97 |
| 132 | Endocrinology | 19 | 737 | 1594 | 1717 |
| 133 | Radiation | 14 | 730 | 1190 | 608 |
| 134 | environmental indicators | 22 | 713 | 220 | 312 |
| 135 | Hydraulic Engineering | 37 | 704 | 248 | 323 |
| 136 | Cosmochemistry | 18 | 638 | 322 | 347 |
| 137 | Statistics | 13 | 637 | 1577 | 915 |
| 138 | Continental shelf | 24 | 636 | 90 | 137 |
| 139 | Nuclear Physics | 7 | 630 | 3539 | 2055 |
| 140 | Computational Biology | 14 | 629 | 1523 | 1248 |
| 141 | Physical Chemistry | 26 | 620 | 888 | 1063 |
| 142 | freshwater biology | 20 | 614 | 271 | 287 |
| 143 | Plant breeding | 5 | 605 | 750 | 220 |
| 143 | eugenics | 5 | 605 | 451 | 122 |
| 143 | Breeding | 5 | 605 | 1096 | 475 |
| 146 | Physiology | 17 | 604 | 2293 | 2213 |
| 147 | radiative transfer | 9 | 597 | 373 | 163 |
| 148 | Kinetics | 24 | 583 | 62 | 67 |
| 148 | Chemical kinetics | 24 | 583 | 124 | 66 |
| 150 | Geochemical Modeling | 35 | 581 | 46 | 142 |
| 150 | geological modeling | 35 | 581 | 51 | 159 |
| 152 | Sustainable Development | 5 | 560 | 1954 | 876 |
| 153 | Ethology | 13 | 555 | 791 | 924 |
| 154 | Ichthyology | 16 | 542 | 106 | 42 |
| 155 | Surveying | 41 | 535 | 11 | 7 |
| 156 | Biogeography | 10 | 528 | 613 | 695 |
| 157 | Photochemistry | 14 | 522 | 866 | 709 |
| 158 | Animal ecology | 21 | 520 | 454 | 532 |
| 159 | Fluid Mechanics | 29 | 517 | 555 | 650 |
| 160 | Organic Geochemistry | 4 | 513 | 373 | 184 |
| 160 | Environmental risk assessment | 18 | 513 | 55 | 66 |
| 160 | environmental control | 18 | 513 | 34 | 52 |
| 163 | Fisheries Law | 31 | 499 | 18 | 76 |
| 163 | fisheries management | 31 | 499 | 18 | 76 |
| 165 | Restoration Ecology | 11 | 494 | 171 | 144 |
| 166 | Remote Sensing | 19 | 490 | 501 | 335 |
| 167 | Parasitology | 12 | 486 | 1496 | 1077 |
| 168 | Toxins | 10 | 485 | 428 | 252 |
| 169 | free radicals | 1 | 483 | 2553 | 907 |
| 170 | Birds | 10 | 466 | 776 | 400 |
| 171 | Fish | 6 | 449 | 243 | 46 |
| 172 | Ecological Genetics | 20 | 437 | 125 | 123 |
| 173 | Light | 11 | 436 | 543 | 820 |
| 174 | Human genetics | 2 | 434 | 3192 | 2868 |
| 175 | food contamination | 6 | 427 | 759 | 255 |
| 175 | biological monitoring | 11 | 427 | 168 | 148 |
| 177 | Environmental Law | 5 | 420 | 990 | 871 |
| 178 | Immunology | 4 | 410 | 4065 | 2746 |
| 179 | Fish diseases | 16 | 408 | 29 | 40 |
| 179 | Aquatic animals | 16 | 408 | 30 | 40 |
| 181 | Agricultural Ecology | 11 | 403 | 603 | 760 |
| 182 | Biochemistry | 14 | 399 | 5895 | 5925 |
| 182 | Ecosystem management | 23 | 399 | 128 | 327 |
| 184 | aerosol | 13 | 398 | 171 | 156 |
| 185 | Agricultural Chemistry | 16 | 393 | 1124 | 1282 |
| 186 | Mineralogy | 3 | 384 | 1588 | 717 |
| 186 | biological invasions | 9 | 384 | 318 | 260 |
| 188 | Statistical Mechanics | 25 | 383 | 338 | 320 |
| 188 | Magnetohydrodynamics | 25 | 383 | 107 | 146 |
| 190 | Geodynamics | 10 | 381 | 539 | 530 |
| 191 | Protozoa | 3 | 378 | 499 | 206 |
| 192 | Water chemistry | 4 | 376 | 257 | 39 |
| 193 | Reproduction | 4 | 369 | 2479 | 1310 |
| 194 | Radio wave propagation | 13 | 368 | 347 | 189 |
| 195 | Epidemiology | 8 | 364 | 3050 | 2435 |
| 196 | Agricultural Science | 3 | 363 | 245 | 204 |
| 196 | Water quality management | 18 | 363 | 734 | 786 |
| 198 | Marine Biotechnology | 3 | 359 | 260 | 76 |
| 198 | Landslides | 3 | 359 | 267 | 129 |
| 200 | environmental exposure | 11 | 350 | 1013 | 1103 |
| 201 | Scandinavia | 7 | 345 | 525 | 342 |
| 202 | Pesticide residues | 2 | 342 | 103 | 29 |
| 202 | Food additives | 2 | 342 | 1715 | 711 |
| 204 | Land use | 5 | 327 | 1004 | 614 |
| 205 | carcinogens | 3 | 324 | 1212 | 695 |
| 206 | primary prevention | 1 | 319 | 893 | 155 |
| 207 | Economics | 12 | 318 | 2758 | 2139 |
| 208 | cryosphere | 10 | 310 | 222 | 281 |
| 209 | Medical Oncology | 2 | 307 | 2687 | 1408 |
| 209 | Carcinogenesis | 2 | 307 | 1496 | 732 |
| 209 | mutagens | 2 | 307 | 1199 | 675 |
| 209 | Genes | 9 | 307 | 699 | 591 |
| 213 | Medical Microbiology | 3 | 306 | 2896 | 2024 |
| 214 | venom | 7 | 305 | 529 | 360 |
| 215 | soil conservation | 2 | 302 | 1206 | 383 |
| 215 | land degradation | 2 | 302 | 760 | 199 |
| 215 | degradation | 2 | 302 | 760 | 199 |
| 218 | Comparative Physiology | 9 | 301 | 523 | 460 |
| 219 | Molecular evolution | 7 | 279 | 1141 | 1211 |
| 220 | Photography | 102 | 275 | 448 | 520 |
| 221 | Solar Energy | 3 | 274 | 2026 | 1282 |
| 222 | Anatomy | 7 | 271 | 1589 | 1386 |
| 223 | Climate Change Mitigation | 4 | 268 | 23 | 68 |
| 223 | Global warming | 4 | 268 | 83 | 69 |
| 223 | sea level | 4 | 268 | 23 | 68 |
| 226 | Phylogeny | 6 | 265 | 705 | 741 |
| 227 | Ecological Engineering | 8 | 264 | 318 | 448 |
| 228 | Parasitic Diseases | 7 | 261 | 1719 | 1531 |
| 229 | Ore deposits | 1 | 253 | 891 | 321 |
| 230 | toxicity testing | 5 | 250 | 596 | 402 |
| 231 | Paleoclimatology | 8 | 246 | 777 | 838 |
| 231 | Paleoecology | 8 | 246 | 739 | 763 |
| 231 | Paleogeography | 8 | 246 | 634 | 701 |
| 234 | sustainability | 3 | 242 | 970 | 765 |
| 235 | Seismology | 14 | 239 | 230 | 307 |
| 236 | Economic Development | 4 | 232 | 1727 | 1346 |
| 237 | DNA | 11 | 230 | 220 | 294 |
| 238 | global environmental change | 4 | 226 | 879 | 804 |
| 239 | Ornithology | 6 | 225 | 841 | 522 |
| 239 | plankton | 13 | 225 | 46 | 116 |
| 241 | Electronics | 14 | 222 | 2137 | 2072 |
| 241 | Wildlife management | 6 | 222 | 482 | 283 |
| 243 | Neuropsychology | 3 | 219 | 2699 | 1777 |
| 243 | Neurophysiology | 3 | 219 | 3367 | 2565 |
| 243 | Psychophysiology | 3 | 219 | 3231 | 2454 |
| 246 | Morphology | 4 | 215 | 865 | 434 |
| 247 | Environmental Microbiology | 4 | 207 | 1418 | 1455 |
| 247 | Parasites | 3 | 207 | 1979 | 1114 |
| 249 | Visual Perception | 9 | 203 | 1209 | 1444 |
| 249 | Memory | 9 | 203 | 1326 | 1626 |
| 249 | Attention | 9 | 203 | 1261 | 1495 |
| 249 | Perception | 9 | 203 | 1348 | 1609 |
| 253 | Diagnostic microbiology | 2 | 200 | 1950 | 1693 |
| 254 | California | 5 | 199 | 379 | 245 |
| 255 | shellfish | 13 | 195 | 39 | 62 |
| 256 | Immunotoxicology | 3 | 190 | 339 | 90 |
| 257 | Virology | 5 | 187 | 3064 | 3568 |
| 257 | Radio | 7 | 187 | 607 | 409 |
| 259 | Plant Ecology | 7 | 185 | 1376 | 1706 |
| 260 | Cytology | 5 | 184 | 4115 | 4331 |
| 261 | Marine Geophysics | 8 | 182 | 108 | 108 |
| 262 | Korea | 2 | 181 | 567 | 93 |
| 262 | Asia | 2 | 181 | 4320 | 1492 |
| 264 | Medical genetics | 1 | 175 | 4706 | 3203 |
| 265 | Developing countries | 3 | 174 | 3015 | 1773 |
| 266 | Wind power | 6 | 170 | 191 | 168 |
| 266 | Australia | 2 | 170 | 2951 | 1214 |
| 266 | gene mapping | 3 | 170 | 2560 | 2241 |
| 269 | bioclimatology | 7 | 169 | 611 | 670 |
| 270 | Public Health | 11 | 166 | 4068 | 5404 |
| 271 | rivers | 9 | 165 | 117 | 199 |
| 272 | Wetland ecology | 7 | 161 | 218 | 303 |
| 273 | Medical Laboratory Science | 5 | 159 | 1984 | 2086 |
| 273 | Wetland conservation | 6 | 159 | 166 | 205 |
| 273 | Wetlands | 6 | 159 | 168 | 205 |
| 276 | Geographic information systems | 12 | 157 | 464 | 626 |
| 276 | calcification | 1 | 157 | 1072 | 544 |
| 278 | Cartography | 11 | 149 | 202 | 171 |
| 279 | economic forecasting | 1 | 148 | 728 | 294 |
| 279 | Forecasting | 1 | 148 | 1147 | 411 |
| 281 | Embryology | 2 | 146 | 2142 | 1811 |
| 282 | Geobiology | 8 | 144 | 284 | 438 |
| 282 | Japan | 10 | 144 | 1176 | 1279 |
| 284 | Dermatology | 2 | 140 | 2600 | 1638 |
| 284 | Neural circuitry | 6 | 140 | 1637 | 1943 |
| 286 | Cancer | 2 | 136 | 5067 | 3994 |
| 287 | Pacific Islands | 5 | 135 | 223 | 115 |
| 288 | food technology | 2 | 128 | 3526 | 2658 |
| 289 | Aquatic ecosystems | 10 | 126 | 52 | 61 |
| 290 | Food | 1 | 125 | 5459 | 3282 |
| 291 | Paleoceanography | 3 | 119 | 230 | 315 |
| 291 | Chromosome mapping | 2 | 119 | 2789 | 2350 |
| 293 | Waterways | 15 | 118 | 46 | 124 |
| 293 | Harbors | 15 | 118 | 50 | 130 |
| 295 | Hormones | 3 | 113 | 1592 | 1562 |
| 296 | chemical spills | 14 | 111 | 4 | 22 |
| 297 | Petrology | 1 | 105 | 1441 | 1002 |
| 298 | Immunopharmacology | 1 | 104 | 2070 | 1175 |
| 299 | Bacteriology | 4 | 103 | 2054 | 2560 |
| 300 | Sedimentology | 3 | 102 | 701 | 677 |
| 301 | Nervous system | 4 | 101 | 2664 | 3183 |
| 302 | Statistical physics | 4 | 99 | 3767 | 3348 |
| 303 | Analytical Biochemistry | 3 | 97 | 2218 | 1968 |
| 303 | Freshwater invertebrates | 6 | 97 | 132 | 287 |
| 305 | Photobiology | 6 | 95 | 1151 | 1542 |
| 306 | Entomology | 4 | 94 | 2508 | 2019 |
| 307 | Quality Control | 5 | 92 | 1695 | 2034 |
| 308 | Civil Engineering | 5 | 88 | 1838 | 1378 |
| 309 | Physical Geography | 5 | 86 | 471 | 545 |
| 309 | Business | 2 | 86 | 3081 | 2401 |
| 311 | Pesticides | 4 | 85 | 643 | 665 |
| 312 | Neurology | 2 | 81 | 7015 | 6427 |
| 312 | Molecules | 2 | 81 | 2154 | 1453 |
| 314 | Ecohydrology | 3 | 80 | 418 | 390 |
| 315 | Law of the Sea | 8 | 79 | 18 | 23 |
| 316 | Maritime Law | 7 | 78 | 28 | 27 |
| 316 | Marine Conservation | 7 | 78 | 20 | 23 |
| 318 | Transportation | 2 | 77 | 2267 | 1839 |
| 318 | Marine invertebrates | 3 | 77 | 277 | 171 |
| 318 | Roads | 2 | 77 | 1022 | 624 |
| 321 | Electrical Engineering | 7 | 76 | 2870 | 2621 |
| 321 | Origin of life | 1 | 76 | 331 | 168 |
| 321 | Research Design | 4 | 76 | 1263 | 1638 |
| 321 | Measurement | 4 | 76 | 1307 | 1446 |
| 321 | Organelle biogenesis | 1 | 76 | 482 | 269 |
| 321 | standardization | 4 | 76 | 39 | 67 |
| 327 | Chemical Engineering | 1 | 74 | 6765 | 5248 |
| 327 | Energy Conversion | 1 | 74 | 2105 | 1838 |
| 327 | Geomagnetism | 6 | 74 | 525 | 736 |
| 327 | Biotelemetry | 6 | 74 | 32 | 94 |
| 331 | Radiology | 3 | 72 | 2048 | 1669 |
| 331 | cosmic rays | 2 | 72 | 713 | 503 |
| 331 | Hydrodynamics | 1 | 72 | 1061 | 781 |
| 334 | Landscape Ecology | 4 | 71 | 458 | 760 |
| 334 | Cell Biology | 2 | 71 | 5414 | 5577 |
| 334 | Water Microbiology | 3 | 71 | 523 | 659 |
| 334 | Malaria | 1 | 71 | 1478 | 990 |
| 338 | Electromagnetic waves | 3 | 70 | 252 | 221 |
| 339 | Biological Systems | 1 | 69 | 1691 | 895 |
| 340 | Risk Management | 5 | 67 | 590 | 934 |
| 341 | economic policy | 1 | 66 | 4429 | 2253 |
| 342 | Environmental Geology | 6 | 61 | 1359 | 2208 |
| 343 | Biotechnology | 3 | 59 | 7251 | 8162 |
| 344 | Probability | 4 | 58 | 607 | 870 |
| 344 | Financial management | 4 | 58 | 478 | 905 |
| 344 | Risk | 4 | 58 | 540 | 891 |
| 347 | Emerging infectious diseases | 1 | 55 | 760 | 601 |
| 348 | Engineering Geology | 5 | 52 | 1273 | 1938 |
| 348 | Herpetology | 5 | 52 | 266 | 338 |
| 348 | arthritis | 2 | 52 | 1777 | 2240 |
| 348 | Navigation | 3 | 52 | 482 | 433 |
| 352 | Reptiles | 2 | 51 | 537 | 311 |
| 352 | DNA polymerases | 1 | 51 | 965 | 1314 |
| 354 | Animal Biotechnology | 1 | 50 | 403 | 263 |
| 354 | Artificial Intelligence | 4 | 50 | 3965 | 4622 |
| 354 | Animal breeding | 1 | 50 | 1418 | 1052 |
| 354 | animals | 1 | 50 | 2479 | 1577 |
| 354 | animal diseases | 1 | 50 | 1003 | 742 |
| 359 | Photonics | 4 | 49 | 1792 | 2506 |
| 359 | ports | 5 | 49 | 195 | 410 |
| 361 | Structural Engineering | 3 | 48 | 1899 | 2070 |
| 361 | Renewable Energy Sources | 1 | 48 | 4534 | 4588 |
| 361 | Rock deformation | 2 | 48 | 319 | 382 |
| 361 | preventive medicine | 2 | 48 | 1995 | 2239 |
| 365 | Communication in politics | 1 | 44 | 566 | 265 |
| 365 | Southern states | 3 | 44 | 341 | 325 |
| 365 | Europe | 1 | 44 | 6313 | 4251 |
| 368 | Paleontology | 3 | 43 | 1515 | 1639 |
| 368 | Diabetes mellitus | 1 | 43 | 3948 | 3789 |
| 368 | Diabetes | 1 | 43 | 4068 | 3846 |
| 371 | Agronomy | 2 | 42 | 869 | 1153 |
| 371 | Travel | 1 | 42 | 1921 | 1290 |
| 373 | Biophysics | 4 | 41 | 6105 | 7905 |
| 373 | Ocean-atmosphere interaction | 4 | 41 | 98 | 71 |
| 373 | Proteome | 1 | 41 | 2240 | 2315 |
| 373 | clay | 2 | 41 | 1137 | 1614 |
| 373 | clay minerals | 2 | 41 | 422 | 575 |
| 373 | proteins | 1 | 41 | 3884 | 3273 |
| 379 | Histology | 1 | 40 | 3391 | 3174 |
| 379 | Greenhouse gases | 2 | 40 | 492 | 790 |
| 379 | lasers | 1 | 40 | 3356 | 2378 |
| 382 | Regional Planning | 4 | 39 | 1594 | 2100 |
| 382 | city planning | 6 | 39 | 1328 | 2294 |
| 384 | Bioengineering | 2 | 38 | 6082 | 6951 |
| 384 | heredity | 2 | 38 | 1026 | 1168 |
| 384 | Population | 4 | 38 | 1033 | 1642 |
| 387 | Bioavailability | 2 | 37 | 110 | 145 |
| 388 | Plant physiology | 1 | 36 | 3458 | 3522 |
| 389 | Freeze-Drying | 2 | 35 | 692 | 805 |
| 389 | Hypothermia | 2 | 35 | 692 | 805 |
| 389 | Freeze Drying | 2 | 35 | 692 | 805 |
| 389 | public works | 1 | 35 | 455 | 309 |
| 393 | Engineering Mathematics | 2 | 33 | 3637 | 3162 |
| 393 | System analysis | 6 | 33 | 2172 | 3664 |
| 395 | Dietetics | 2 | 32 | 1150 | 1233 |
| 395 | Plant Taxonomy | 1 | 32 | 806 | 702 |
| 395 | Environmental Economics | 2 | 32 | 645 | 804 |
| 395 | emergency management | 3 | 32 | 1048 | 1652 |
| 395 | Diet | 2 | 32 | 3098 | 4175 |
| 400 | occupational diseases | 1 | 31 | 1862 | 1944 |
| 400 | Recycling | 1 | 31 | 1221 | 1714 |
| 402 | Economic History | 5 | 30 | 3547 | 4335 |
| 402 | Photogrammetry | 7 | 30 | 559 | 753 |
| 404 | Pharmacognosy | 2 | 29 | 2604 | 3538 |
| 404 | natural products | 2 | 29 | 2514 | 2696 |
| 406 | Urbanization | 2 | 27 | 369 | 421 |
| 406 | Air pollution | 2 | 27 | 13 | 64 |
| 406 | Celestial Mechanics | 2 | 27 | 292 | 329 |
| 406 | Urban climatology | 2 | 27 | 13 | 64 |
| 410 | Proteomics | 2 | 26 | 1709 | 2578 |
| 411 | Environmental Sociology | 1 | 25 | 99 | 97 |
| 412 | Genetic engineering | 2 | 24 | 3164 | 4316 |
| 412 | Functional Genomics | 1 | 24 | 626 | 886 |
| 412 | Molecular cloning | 2 | 24 | 2167 | 2920 |
| 412 | Genetic recombination | 2 | 24 | 2127 | 2872 |
| 412 | water resources | 2 | 24 | 498 | 613 |
| 412 | Library Science | 2 | 24 | 1840 | 1447 |
| 412 | Urban Areas | 2 | 24 | 361 | 473 |
| 412 | Recombinant DNA | 2 | 24 | 2266 | 3053 |
| 412 | genome | 1 | 24 | 3122 | 3478 |
| 421 | Veterinary Immunology | 1 | 23 | 736 | 805 |
| 422 | Marine biodiversity | 3 | 22 | 320 | 458 |
| 422 | Forest Management | 5 | 22 | 897 | 2041 |
| 424 | Industrial Microbiology | 1 | 21 | 3629 | 4167 |
| 425 | Underwater Archaeology | 5 | 20 | 82 | 163 |
| 425 | management | 1 | 20 | 5875 | 5547 |
| 425 | Development | 2 | 20 | 1173 | 1874 |
| 425 | investigative techniques | 1 | 20 | 342 | 531 |
| 429 | Industrial Engineering | 1 | 19 | 3522 | 3552 |
| 429 | Applied Mathematics | 1 | 19 | 2042 | 1175 |
| 429 | Sound | 5 | 19 | 716 | 1227 |
| 429 | disaster relief | 1 | 19 | 547 | 648 |
| 429 | international cooperation | 1 | 19 | 1290 | 1432 |
| 434 | Fluid Dynamics | 2 | 18 | 1681 | 2192 |
| 435 | Archaeology | 4 | 17 | 1398 | 2158 |
| 435 | Earthquake Engineering | 1 | 17 | 2089 | 2370 |
| 435 | Ecophysiology | 1 | 17 | 566 | 701 |
| 435 | Signal Processing | 1 | 17 | 3551 | 3538 |
| 435 | Soil dynamics | 1 | 17 | 892 | 1081 |
| 435 | Mutagenesis | 1 | 17 | 1063 | 1264 |
| 435 | teratogenic agents | 1 | 17 | 590 | 648 |
| 435 | disease vectors | 1 | 17 | 1909 | 2414 |
| 435 | Zoonoses | 1 | 17 | 705 | 959 |
| 444 | Soil Science | 3 | 16 | 2217 | 3635 |
| 444 | Stochastic Processes | 1 | 16 | 1783 | 1692 |
| 444 | Forest Ecology | 4 | 16 | 1067 | 2332 |
| 444 | Industrial Safety | 1 | 16 | 2408 | 2475 |
| 444 | industrial hygiene | 2 | 16 | 1761 | 2111 |
| 444 | Mitochondrial DNA | 2 | 16 | 326 | 360 |
| 444 | Social behavior | 1 | 16 | 2240 | 2459 |
| 444 | North America | 4 | 16 | 909 | 1907 |
| 452 | Neurobiology | 1 | 15 | 3091 | 3835 |
| 452 | Primary health care | 1 | 15 | 3756 | 4148 |
| 454 | Glaciology | 5 | 14 | 177 | 502 |
| 454 | air quality management | 1 | 14 | 1232 | 1751 |
| 454 | Helminthology | 1 | 14 | 368 | 310 |
| 454 | Happiness | 1 | 14 | 971 | 1256 |
| 454 | Turbulence | 1 | 14 | 498 | 579 |
| 454 | human behavior | 2 | 14 | 3504 | 5782 |
| 454 | Earthquakes | 8 | 14 | 247 | 846 |
| 454 | Quality of life | 1 | 14 | 3032 | 3869 |
| 454 | drainage | 3 | 14 | 463 | 814 |
| 454 | Helminths | 1 | 14 | 368 | 310 |
| 454 | glaciers | 5 | 14 | 163 | 470 |
| 465 | Geriatrics | 2 | 13 | 4536 | 5819 |
| 465 | Econometrics | 3 | 13 | 1570 | 2284 |
| 465 | Acoustics | 4 | 13 | 247 | 340 |
| 465 | Accreditation | 1 | 13 | 245 | 210 |
| 465 | Mycology | 1 | 13 | 2897 | 3374 |
| 465 | Mollusks | 3 | 13 | 279 | 531 |
| 471 | Waste management | 2 | 12 | 2118 | 3192 |
| 471 | Developmental Immunology | 1 | 12 | 1583 | 2144 |
| 471 | fishing industry | 1 | 12 | 302 | 414 |
| 471 | Societies | 2 | 12 | 242 | 346 |
| 475 | Human Geography | 4 | 11 | 1075 | 2195 |
| 475 | Radiography | 1 | 11 | 1295 | 1599 |
| 475 | Diagnosis | 1 | 11 | 1397 | 1767 |
| 475 | Diagnostic Imaging | 1 | 11 | 4113 | 4518 |
| 475 | Information Science | 3 | 11 | 2999 | 5278 |
| 480 | Information Systems | 2 | 10 | 2142 | 3669 |
| 480 | Cosmology | 1 | 10 | 2294 | 2155 |
| 480 | Regional Economics | 1 | 10 | 918 | 1140 |
| 480 | Particle Physics | 1 | 10 | 1482 | 1361 |
| 480 | Watershed management | 1 | 10 | 601 | 745 |
| 480 | Input-output analysis | 1 | 10 | 568 | 732 |
| 480 | Documentation | 2 | 10 | 523 | 801 |
| 480 | marketing | 3 | 10 | 2084 | 3538 |
| 480 | medical education | 1 | 10 | 3884 | 4357 |
| 489 | Anthropology | 3 | 9 | 1897 | 3045 |
| 489 | Occupational Health | 2 | 9 | 1703 | 2637 |
| 489 | Occupational exposure | 1 | 9 | 167 | 217 |
| 489 | Flood forecasting | 1 | 9 | 307 | 552 |
| 489 | Reservoirs | 2 | 9 | 279 | 604 |
| 489 | Flood control | 1 | 9 | 691 | 935 |
| 489 | social marketing | 1 | 9 | 153 | 281 |
| 496 | Sociology | 1 | 8 | 5829 | 6637 |
| 496 | Freshwater Ecology | 1 | 8 | 599 | 815 |
| 496 | behavioral medicine | 1 | 8 | 2673 | 3901 |
| 496 | forest policy | 2 | 8 | 516 | 1160 |
| 496 | Approximation Theory | 1 | 8 | 786 | 852 |
| 501 | Forensic Genetics | 1 | 7 | 515 | 805 |
| 501 | Genetic epidemiology | 1 | 7 | 604 | 904 |
| 501 | environmental justice | 1 | 7 | 104 | 134 |
| 501 | Animal migration | 1 | 7 | 15 | 48 |
| 501 | social justice | 1 | 7 | 752 | 796 |
| 501 | Public opinion | 1 | 7 | 836 | 1246 |
| 501 | Animal genetics | 1 | 7 | 1101 | 1584 |
| 501 | visualization | 3 | 7 | 2113 | 2825 |
| 501 | Chemical analysis | 1 | 7 | 2141 | 2993 |
| 501 | immigration | 1 | 7 | 439 | 668 |
| 501 | migration policy | 1 | 7 | 452 | 732 |
| 501 | Asylum seeker | 1 | 7 | 358 | 631 |
| 501 | Behavior | 2 | 7 | 4512 | 7461 |
| 501 | Plants | 2 | 7 | 3025 | 4533 |
| 515 | Systems Engineering | 3 | 6 | 2697 | 4555 |
| 515 | Computer Graphics | 1 | 6 | 2978 | 3731 |
| 515 | Planetary Science | 2 | 6 | 807 | 1394 |
| 515 | Computer Vision | 1 | 6 | 2153 | 2935 |
| 515 | Image Processing | 1 | 6 | 3671 | 4545 |
| 515 | Emergency Medicine | 1 | 6 | 3000 | 3802 |
| 515 | Politics | 1 | 6 | 1272 | 1101 |
| 515 | Biopolitics | 1 | 6 | 74 | 139 |
| 515 | Quantum Optics | 1 | 6 | 1625 | 1987 |
| 515 | Environmentalism | 1 | 6 | 311 | 549 |
| 515 | Groundwater | 1 | 6 | 1316 | 1864 |
| 515 | Tropical Medicine | 1 | 6 | 3693 | 4821 |
| 515 | Atomic spectroscopy | 1 | 6 | 2065 | 2555 |
| 515 | health services | 1 | 6 | 2292 | 3285 |
| 515 | Laser Spectroscopy | 1 | 6 | 1548 | 1904 |
| 515 | India | 2 | 6 | 2692 | 3772 |
| 531 | air quality | 1 | 5 | 656 | 1137 |
| 531 | Child psychology | 1 | 5 | 2735 | 3766 |
| 531 | land | 2 | 5 | 89 | 231 |
| 531 | Insects | 1 | 5 | 2647 | 3314 |
| 531 | plant communities | 1 | 5 | 1902 | 2779 |
| 536 | microwave antennas | 1 | 4 | 857 | 1199 |
| 536 | histological techniques | 1 | 4 | 1524 | 2194 |
| 536 | Moon | 1 | 4 | 423 | 553 |
| 536 | Microwaves | 1 | 4 | 1960 | 2271 |
| 536 | Economic Assistance | 1 | 4 | 1443 | 2226 |
| 536 | extraterrestrial environment | 5 | 4 | 527 | 1808 |
| 536 | astronomical phenomena | 5 | 4 | 479 | 1669 |
| 536 | world | 1 | 4 | 1436 | 2394 |
| 544 | Information Technology | 1 | 3 | 4901 | 6192 |
| 544 | Knowledge management | 1 | 3 | 1578 | 2236 |
| 544 | Outdoor Education | 1 | 3 | 173 | 317 |
| 544 | Adventure education | 1 | 3 | 126 | 259 |
| 544 | Volcanoes | 1 | 3 | 556 | 865 |
| 544 | Foodborne diseases | 1 | 3 | 616 | 1091 |
| 544 | Lipids | 1 | 3 | 2566 | 3754 |
| 544 | irrigation | 1 | 3 | 873 | 1348 |
| 544 | Lipid | 1 | 3 | 891 | 1503 |
| 553 | Coastal Engineering | 5 | 2 | 91 | 526 |
| 553 | Public Health Informatics | 1 | 2 | 223 | 268 |
| 553 | Acoustic holography | 1 | 2 | 216 | 205 |
| 553 | technology transfer | 1 | 2 | 640 | 1110 |
| 553 | Open source software | 3 | 2 | 61 | 290 |
| 553 | Bioacoustics | 1 | 2 | 231 | 498 |
| 553 | Nonlinear Dynamics | 1 | 2 | 3449 | 4562 |
| 553 | embryonic development | 1 | 2 | 868 | 1389 |
| 553 | Ultrasonics | 1 | 2 | 2081 | 3153 |
| 553 | Holography | 1 | 2 | 216 | 205 |
| 553 | Acoustic imaging | 1 | 2 | 216 | 205 |
| 553 | Ultrasonic Imaging | 1 | 2 | 1079 | 1769 |
| 553 | Africa | 1 | 2 | 3304 | 4469 |
| 553 | Soviet Union | 1 | 2 | 1618 | 2138 |
| 553 | wetland management | 1 | 2 | 457 | 952 |
| 553 | hygiene | 1 | 2 | 1176 | 2062 |
| 569 | History | 1 | 1 | 2109 | 1848 |
| 569 | Nuclear Engineering | 1 | 1 | 2274 | 3140 |
| 569 | Environmental Geography | 1 | 1 | 128 | 310 |
| 569 | Microeconomics | 1 | 1 | 691 | 1023 |
| 569 | Indigenous Peoples | 1 | 1 | 264 | 470 |
| 569 | Social Media | 1 | 1 | 461 | 721 |
| 569 | Mountains | 1 | 1 | 952 | 1555 |
| 569 | Amphibians | 3 | 1 | 330 | 1029 |
| 569 | language | 1 | 1 | 1457 | 2092 |
| 578 | Education | 1 | 0 | 7125 | 9677 |
| 578 | Urban Planning | 1 | 0 | 814 | 1474 |
| 578 | Mathematical Physics | 2 | 0 | 4149 | 6117 |
| 578 | Metallurgy | 1 | 0 | 4047 | 5549 |
| 578 | Aerial Photography | 1 | 0 | 52 | 151 |
| 578 | community development | 1 | 0 | 1189 | 2042 |
| 578 | Cellular senescence | 1 | 0 | 1519 | 2612 |
| 578 | Electrochemistry | 1 | 0 | 5696 | 7135 |
| 578 | Entropy | 1 | 0 | 2325 | 3534 |
| 578 | Housing | 1 | 0 | 933 | 1655 |
| 578 | Interfaces | 1 | 0 | 749 | 1362 |
| 578 | Radioisotopes | 1 | 0 | 2354 | 3576 |
| 578 | territorial expansion | 1 | 0 | 260 | 117 |
| 578 | Marine sediments | 1 | 0 | 72 | 131 |
| 578 | deviant behavior | 1 | 0 | 556 | 944 |
| 578 | mathematical analysis | 1 | 0 | 3668 | 4722 |
