| 1 | Geophysics | 1,207 | 48.2K | 51 | 62 |
| 2 | Meteorology | 753 | 44.2K | 28 | 30 |
| 3 | Climatology | 467 | 35.2K | 25 | 15 |
| 4 | Planets | 740 | 30.2K | 21 | 30 |
| 5 | Earth Sciences | 355 | 29.8K | 57 | 27 |
| 6 | Science | 258 | 29.6K | 972 | 718 |
| 7 | Biology | 269 | 24.8K | 899 | 788 |
| 8 | Physics | 230 | 23.8K | 1202 | 903 |
| 9 | Oceanography | 571 | 18.5K | 26 | 46 |
| 10 | Geology | 432 | 18.1K | 119 | 116 |
| 11 | Natural history | 114 | 17.1K | 450 | 608 |
| 12 | Atmospheric Physics | 351 | 15.4K | 52 | 72 |
| 13 | Microbiology | 320 | 15.1K | 486 | 517 |
| 14 | Geochemistry | 406 | 13.2K | 50 | 102 |
| 15 | Astronomy | 246 | 12.6K | 395 | 393 |
| 16 | Environment | 148 | 10.3K | 527 | 518 |
| 17 | Atmospheric Chemistry | 197 | 10.2K | 51 | 79 |
| 18 | Microbial Ecology | 180 | 10.0K | 109 | 165 |
| 19 | atmospheric models | 94 | 9.1K | 42 | 23 |
| 20 | Biogeochemistry | 100 | 7.8K | 63 | 48 |
| 21 | Ecology | 187 | 7.6K | 691 | 797 |
| 22 | Marine Biology | 285 | 7.1K | 87 | 147 |
| 23 | Chemistry | 125 | 7.1K | 1859 | 1450 |
| 24 | Biodiversity | 97 | 6.8K | 159 | 109 |
| 25 | Pollution | 62 | 5.1K | 1197 | 828 |
| 26 | Biogeochemical cycles | 57 | 4.7K | 24 | 31 |
| 27 | Meteorites | 131 | 4.5K | 76 | 153 |
| 28 | Geodynamics | 181 | 4.1K | 13 | 57 |
| 29 | Research | 140 | 4.0K | 1241 | 1319 |
| 30 | Extreme environments | 71 | 3.9K | 1 | 1 |
| 31 | Petrology | 135 | 3.8K | 53 | 108 |
| 32 | Biodiversity conservation | 30 | 3.7K | 448 | 352 |
| 33 | Climate change | 26 | 3.6K | 280 | 291 |
| 33 | Eutrophication | 26 | 3.6K | 276 | 288 |
| 35 | Medicine | 86 | 3.2K | 2187 | 2195 |
| 36 | Mineralogy | 130 | 3.1K | 85 | 162 |
| 37 | Geomagnetism | 104 | 2.9K | 33 | 33 |
| 38 | Japan | 199 | 2.9K | 74 | 74 |
| 39 | Environmental Health | 66 | 2.8K | 1012 | 999 |
| 40 | Marine Meteorology | 61 | 2.8K | 47 | 41 |
| 41 | Biochemistry | 74 | 2.4K | 2298 | 2252 |
| 42 | Biotechnology | 76 | 2.2K | 1260 | 1617 |
| 43 | Spectrum analysis | 60 | 2.1K | 938 | 926 |
| 44 | Molecular Biology | 55 | 2.0K | 2233 | 2387 |
| 45 | Environmental Microbiology | 33 | 2.0K | 241 | 254 |
| 46 | Microorganisms | 64 | 2.0K | 48 | 181 |
| 47 | Data Mining | 11 | 1.9K | 679 | 217 |
| 47 | data collection | 11 | 1.9K | 379 | 143 |
| 49 | Plate Tectonics | 93 | 1.7K | 4 | 6 |
| 50 | Cosmochemistry | 37 | 1.5K | 122 | 132 |
| 51 | Water | 20 | 1.4K | 925 | 781 |
| 52 | Astrophysics | 37 | 1.3K | 1057 | 1093 |
| 53 | Analytical Chemistry | 65 | 1.3K | 1048 | 1312 |
| 54 | Fisheries | 44 | 1.3K | 292 | 303 |
| 55 | biological evolution | 31 | 1.2K | 589 | 713 |
| 56 | Water pollution | 24 | 1.2K | 938 | 853 |
| 57 | Zoology | 55 | 1.2K | 488 | 481 |
| 58 | Organic Geochemistry | 17 | 1.2K | 101 | 78 |
| 59 | Bioengineering | 46 | 1.1K | 1050 | 1593 |
| 60 | Environmental Engineering | 25 | 1.1K | 1325 | 1164 |
| 61 | Technology | 45 | 1.1K | 983 | 952 |
| 62 | polar regions | 73 | 1.1K | 37 | 82 |
| 63 | Geochemical Modeling | 23 | 1.1K | 54 | 72 |
| 63 | geological modeling | 23 | 1.1K | 65 | 75 |
| 65 | Hydrology | 31 | 1.1K | 719 | 654 |
| 66 | Paleoclimatology | 31 | 1.0K | 260 | 308 |
| 67 | Paleoecology | 29 | 998 | 260 | 262 |
| 67 | Paleogeography | 29 | 998 | 208 | 236 |
| 69 | Asia | 22 | 888 | 836 | 362 |
| 70 | global environmental change | 12 | 864 | 309 | 252 |
| 70 | Protozoa | 30 | 864 | 43 | 98 |
| 72 | atmosphere | 37 | 856 | 81 | 123 |
| 73 | sanitation | 16 | 831 | 657 | 763 |
| 74 | Antarctica | 56 | 815 | 38 | 48 |
| 75 | Botany | 27 | 798 | 1452 | 1549 |
| 76 | Genomics | 22 | 742 | 1155 | 1184 |
| 77 | Geobiology | 25 | 724 | 71 | 89 |
| 78 | Industrial Microbiology | 19 | 722 | 625 | 732 |
| 79 | Agricultural Chemistry | 28 | 708 | 651 | 784 |
| 80 | Statistical physics | 34 | 700 | 1267 | 1223 |
| 81 | Minerals | 27 | 699 | 72 | 97 |
| 82 | Educational Psychology | 26 | 695 | 409 | 444 |
| 83 | Molecular evolution | 18 | 691 | 527 | 588 |
| 84 | Transport | 6 | 687 | 377 | 152 |
| 84 | Sea | 6 | 687 | 332 | 112 |
| 84 | Fishery resources | 6 | 687 | 371 | 125 |
| 87 | Molecular Genetics | 16 | 676 | 758 | 797 |
| 87 | Ore deposits | 11 | 676 | 230 | 140 |
| 89 | Cytology | 10 | 604 | 2549 | 2274 |
| 90 | Biomedical Engineering | 24 | 583 | 1927 | 2161 |
| 91 | China | 28 | 570 | 819 | 829 |
| 92 | Marine Geophysics | 30 | 561 | 20 | 27 |
| 93 | Medical Laboratory Science | 16 | 559 | 918 | 1049 |
| 94 | Nonlinear Dynamics | 29 | 548 | 744 | 839 |
| 95 | Hydrometeorology | 10 | 538 | 91 | 110 |
| 96 | Marine Ecology | 28 | 528 | 136 | 182 |
| 97 | Phylogeny | 12 | 525 | 352 | 382 |
| 98 | Environmental Policy | 4 | 524 | 2838 | 1666 |
| 99 | Evolution | 18 | 513 | 732 | 885 |
| 100 | Ocean Engineering | 31 | 492 | 444 | 659 |
| 101 | exobiology | 9 | 486 | 122 | 122 |
| 102 | Soil Mechanics | 10 | 484 | 629 | 494 |
| 103 | cryosphere | 20 | 467 | 115 | 184 |
| 104 | Rock Mechanics | 9 | 466 | 524 | 398 |
| 105 | water supply | 5 | 462 | 689 | 446 |
| 106 | Bacteriology | 11 | 457 | 987 | 1088 |
| 107 | Immunology | 10 | 443 | 2231 | 2135 |
| 108 | Marine Geology | 15 | 428 | 189 | 208 |
| 109 | Paleoceanography | 9 | 421 | 93 | 133 |
| 110 | Petroleum Geology | 15 | 415 | 178 | 211 |
| 111 | Planetary Science | 31 | 404 | 103 | 156 |
| 112 | Biochemical Engineering | 12 | 399 | 1699 | 2368 |
| 113 | Continental shelf | 10 | 394 | 162 | 163 |
| 114 | Serology | 9 | 392 | 194 | 114 |
| 115 | Infections | 2 | 385 | 1425 | 684 |
| 115 | infection | 2 | 385 | 2033 | 868 |
| 115 | Virulence | 2 | 385 | 1321 | 863 |
| 118 | Seismology | 26 | 383 | 122 | 188 |
| 119 | Coral reef biology | 13 | 379 | 102 | 137 |
| 120 | environmental pollution | 13 | 372 | 2341 | 2679 |
| 121 | Marine Pollution | 12 | 366 | 511 | 646 |
| 122 | Environmental monitoring | 8 | 354 | 2492 | 2342 |
| 123 | Environmental Geology | 14 | 341 | 692 | 834 |
| 123 | plankton | 16 | 341 | 24 | 53 |
| 125 | Solar System | 11 | 340 | 401 | 438 |
| 126 | nucleic acids | 2 | 338 | 2032 | 1257 |
| 127 | Mining Engineering | 10 | 335 | 236 | 219 |
| 128 | bioclimatology | 18 | 331 | 184 | 324 |
| 129 | Genetic engineering | 10 | 329 | 1211 | 1332 |
| 130 | natural disasters | 8 | 326 | 718 | 613 |
| 131 | Marine Biotechnology | 13 | 323 | 43 | 74 |
| 132 | Solid State Physics | 7 | 322 | 2683 | 1955 |
| 133 | Biophysics | 7 | 320 | 4088 | 3366 |
| 134 | Condensed Matter | 9 | 314 | 2254 | 1779 |
| 135 | Environmental Toxicology | 1 | 305 | 3643 | 1559 |
| 135 | ecosystem | 8 | 305 | 763 | 876 |
| 137 | Radiation | 12 | 299 | 1046 | 963 |
| 138 | Periglacial processes | 6 | 298 | 69 | 61 |
| 138 | Permafrost | 6 | 298 | 69 | 61 |
| 138 | Frozen ground | 6 | 298 | 73 | 62 |
| 141 | Environmental Management | 8 | 295 | 1811 | 2026 |
| 142 | Forest Management | 7 | 293 | 627 | 576 |
| 143 | Forest Ecology | 6 | 290 | 741 | 637 |
| 144 | freshwater biology | 10 | 289 | 453 | 431 |
| 145 | hazard mitigation | 5 | 287 | 662 | 401 |
| 146 | Colloids | 14 | 286 | 1869 | 2329 |
| 147 | Archaeology | 11 | 278 | 675 | 572 |
| 148 | fishing industry | 19 | 275 | 33 | 34 |
| 149 | Earthquakes | 11 | 273 | 185 | 155 |
| 149 | Sedimentary rocks | 11 | 273 | 236 | 319 |
| 151 | Cell Biology | 3 | 261 | 3951 | 3180 |
| 152 | Chemical Oceanography | 8 | 258 | 150 | 214 |
| 152 | cell physiology | 2 | 258 | 1809 | 1152 |
| 154 | Electrochemistry | 8 | 251 | 2458 | 2107 |
| 155 | Membranes | 3 | 249 | 1668 | 1286 |
| 156 | Aquatic ecology | 7 | 244 | 589 | 474 |
| 157 | Mass Spectrometry | 10 | 243 | 643 | 682 |
| 157 | pollutants | 10 | 243 | 1001 | 1327 |
| 157 | Environmental pollutants | 10 | 243 | 1268 | 1533 |
| 160 | Glaciology | 13 | 238 | 66 | 114 |
| 161 | Climate Change Mitigation | 1 | 237 | 96 | 54 |
| 161 | Global warming | 1 | 237 | 310 | 58 |
| 161 | sea level | 1 | 237 | 96 | 54 |
| 164 | Molecular ecology | 6 | 222 | 757 | 946 |
| 165 | Climate | 15 | 219 | 128 | 351 |
| 166 | Systems Biology | 10 | 218 | 777 | 964 |
| 167 | Africa | 3 | 217 | 1739 | 546 |
| 168 | Mining Geology | 10 | 216 | 22 | 20 |
| 169 | United States | 10 | 212 | 3017 | 2974 |
| 170 | Animal ecology | 2 | 210 | 1394 | 734 |
| 171 | Organic Chemistry | 9 | 207 | 2061 | 2092 |
| 172 | Paleontology | 21 | 196 | 471 | 743 |
| 172 | Wildlife management | 1 | 196 | 1008 | 264 |
| 174 | enzymes | 8 | 193 | 933 | 1139 |
| 175 | Ecohydrology | 4 | 189 | 280 | 159 |
| 176 | Electronics | 7 | 186 | 2600 | 2233 |
| 177 | weather | 13 | 185 | 147 | 338 |
| 178 | proteins | 10 | 184 | 1210 | 1514 |
| 179 | Engineering Geology | 9 | 183 | 832 | 1033 |
| 180 | wind erosion | 2 | 181 | 142 | 67 |
| 181 | Green Chemistry | 3 | 179 | 1711 | 1549 |
| 182 | glaciers | 6 | 178 | 124 | 132 |
| 183 | Nuclear Physics | 8 | 177 | 2813 | 2546 |
| 184 | Foraminifera | 7 | 173 | 28 | 37 |
| 185 | Sustainable Development | 10 | 170 | 1018 | 1589 |
| 186 | Geomorphology | 6 | 168 | 998 | 1143 |
| 186 | Algae | 9 | 168 | 423 | 550 |
| 188 | Coastal Engineering | 9 | 160 | 36 | 29 |
| 188 | Hydraulic Engineering | 9 | 160 | 629 | 724 |
| 190 | Genes | 8 | 159 | 665 | 803 |
| 191 | Surface Chemistry | 7 | 158 | 2601 | 2847 |
| 192 | Marine biodiversity | 22 | 157 | 23 | 81 |
| 193 | Fluid Mechanics | 9 | 156 | 1011 | 1097 |
| 194 | DNS | 9 | 155 | 199 | 359 |
| 194 | antibiotics | 7 | 155 | 90 | 125 |
| 196 | Nanotechnology | 9 | 152 | 3094 | 3913 |
| 197 | Plant Ecology | 4 | 148 | 1529 | 1602 |
| 197 | weather forecasting | 8 | 148 | 79 | 143 |
| 197 | genome | 6 | 148 | 1122 | 1648 |
| 200 | Atmospheric Science | 6 | 145 | 104 | 133 |
| 200 | Biogeography | 3 | 145 | 955 | 1017 |
| 200 | Energy Policy | 4 | 145 | 2316 | 2562 |
| 203 | Population Genetics | 3 | 143 | 1226 | 1164 |
| 203 | Nuclear Chemistry | 12 | 143 | 489 | 565 |
| 203 | Radiochemistry | 12 | 143 | 446 | 507 |
| 206 | Physical Chemistry | 8 | 142 | 1485 | 1772 |
| 207 | Genetics | 3 | 141 | 3875 | 3676 |
| 207 | Sites | 3 | 141 | 539 | 509 |
| 209 | Chromosome mapping | 6 | 140 | 1326 | 1761 |
| 209 | gene mapping | 6 | 140 | 1460 | 1998 |
| 211 | Greenhouse gases | 5 | 138 | 244 | 348 |
| 212 | Physical organic chemistry | 1 | 137 | 2026 | 1034 |
| 212 | Bioorganic chemistry | 1 | 137 | 3783 | 2405 |
| 214 | Geography | 34 | 135 | 583 | 1661 |
| 215 | Anthropology | 4 | 134 | 1354 | 931 |
| 215 | Mathematics | 9 | 134 | 3814 | 3363 |
| 217 | Polymers | 10 | 133 | 2761 | 3295 |
| 217 | Volcanoes | 4 | 133 | 224 | 227 |
| 219 | Molecular cloning | 6 | 131 | 1074 | 1233 |
| 219 | Genetic recombination | 6 | 131 | 1059 | 1222 |
| 219 | Recombinant DNA | 6 | 131 | 1161 | 1313 |
| 222 | Pharmacognosy | 2 | 129 | 2250 | 1772 |
| 222 | natural products | 2 | 129 | 2183 | 1280 |
| 224 | Chemical Engineering | 15 | 127 | 2314 | 3738 |
| 225 | Land use | 1 | 125 | 1867 | 1013 |
| 226 | Crystallography | 10 | 124 | 971 | 830 |
| 226 | Proteome | 5 | 124 | 943 | 1233 |
| 228 | Engineering | 6 | 122 | 3499 | 3188 |
| 229 | Human evolution | 2 | 121 | 492 | 420 |
| 230 | Chemical industry | 8 | 120 | 796 | 858 |
| 231 | plant communities | 3 | 118 | 1087 | 1141 |
| 232 | Mycology | 5 | 116 | 1294 | 1440 |
| 232 | Korea | 3 | 116 | 354 | 127 |
| 232 | Fungi | 5 | 116 | 826 | 1037 |
| 235 | environmental indicators | 4 | 115 | 996 | 1250 |
| 236 | Ecosystem management | 3 | 109 | 694 | 648 |
| 237 | Wetland ecology | 1 | 108 | 881 | 357 |
| 237 | wetland management | 1 | 108 | 390 | 141 |
| 239 | Aerosols | 6 | 106 | 369 | 471 |
| 240 | Toxicology | 2 | 101 | 5389 | 4602 |
| 240 | X-ray crystallography | 6 | 101 | 433 | 417 |
| 242 | air quality management | 2 | 96 | 676 | 533 |
| 242 | Marine invertebrates | 7 | 96 | 95 | 113 |
| 242 | Mollusks | 11 | 96 | 50 | 92 |
| 245 | Analytical Biochemistry | 2 | 94 | 2215 | 1688 |
| 246 | Optics | 15 | 93 | 2561 | 3250 |
| 246 | Remote Sensing | 8 | 93 | 903 | 1030 |
| 246 | Radio | 2 | 93 | 1871 | 1534 |
| 249 | Biocompatible Materials | 5 | 92 | 2952 | 3906 |
| 250 | Nanostructured Materials | 4 | 91 | 2669 | 2882 |
| 250 | Radioisotopes | 8 | 91 | 690 | 842 |
| 252 | Fluid Dynamics | 8 | 90 | 691 | 994 |
| 253 | Catalysis | 3 | 89 | 3192 | 3247 |
| 254 | Acoustics | 7 | 88 | 221 | 235 |
| 254 | Biomass Energy | 2 | 88 | 2865 | 2753 |
| 254 | Sound | 7 | 88 | 627 | 831 |
| 257 | Soft Condensed Matter | 6 | 84 | 775 | 1108 |
| 257 | biopolymers | 6 | 84 | 860 | 1219 |
| 259 | sedimentary basins | 4 | 83 | 171 | 249 |
| 260 | Hydrogeology | 4 | 82 | 706 | 741 |
| 260 | Engineering Mathematics | 3 | 82 | 2569 | 1816 |
| 262 | Computational Biology | 3 | 79 | 3077 | 2968 |
| 263 | Tourism | 1 | 76 | 2407 | 1736 |
| 263 | management | 1 | 76 | 4827 | 3184 |
| 265 | Bioenergetics | 1 | 75 | 1316 | 1021 |
| 265 | Sustainable Engineering | 4 | 75 | 1469 | 1873 |
| 267 | Petroleum Engineering | 4 | 74 | 677 | 798 |
| 267 | radiocarbon dating | 4 | 74 | 57 | 62 |
| 269 | Groundwater | 3 | 73 | 712 | 705 |
| 270 | Sun | 2 | 72 | 436 | 379 |
| 271 | Coastal zone management | 1 | 71 | 1130 | 774 |
| 271 | Marine resources | 1 | 71 | 1175 | 780 |
| 273 | Robotics | 13 | 70 | 810 | 1717 |
| 274 | Soil Science | 3 | 69 | 1871 | 2063 |
| 274 | Enzyme | 3 | 69 | 493 | 745 |
| 276 | environmental protection | 3 | 68 | 3540 | 4042 |
| 277 | Combinatorial chemistry | 2 | 66 | 1143 | 1183 |
| 277 | radiative transfer | 2 | 66 | 685 | 509 |
| 277 | miniaturization | 2 | 66 | 2176 | 2312 |
| 280 | mycoses | 2 | 65 | 1021 | 1265 |
| 281 | Materials Science | 5 | 61 | 3734 | 4546 |
| 281 | Structural dynamics | 3 | 61 | 1051 | 1315 |
| 281 | Earthquake prediction | 1 | 61 | 113 | 41 |
| 284 | Pharmaceutical Chemistry | 2 | 60 | 4472 | 4332 |
| 284 | soil microbiology | 3 | 60 | 1462 | 2226 |
| 286 | Virology | 5 | 59 | 2427 | 3919 |
| 287 | Bioremediation | 2 | 58 | 1128 | 1241 |
| 287 | Biodegradation | 2 | 58 | 956 | 1118 |
| 289 | Environmental Chemistry | 5 | 57 | 1748 | 2819 |
| 290 | Biological Systems | 4 | 56 | 665 | 876 |
| 291 | Telecommunication | 3 | 54 | 2731 | 2719 |
| 291 | Microscopy | 3 | 54 | 1677 | 1544 |
| 293 | Rheology | 3 | 53 | 524 | 602 |
| 293 | particles | 4 | 53 | 871 | 1229 |
| 293 | Granular materials | 4 | 53 | 466 | 836 |
| 296 | Earthquake Engineering | 5 | 52 | 1008 | 1544 |
| 296 | Microbial Biotechnology | 3 | 52 | 1043 | 1397 |
| 296 | Solid State Chemistry | 2 | 52 | 2657 | 2484 |
| 296 | Rock deformation | 5 | 52 | 137 | 319 |
| 300 | energy conservation | 1 | 51 | 3137 | 2965 |
| 301 | Computational Fluid Dynamics | 4 | 50 | 555 | 772 |
| 302 | Conservation Biology | 2 | 49 | 1429 | 1617 |
| 302 | Origin of life | 2 | 49 | 182 | 202 |
| 302 | Raman spectroscopy | 4 | 49 | 690 | 1052 |
| 302 | Molecular structure | 2 | 49 | 2871 | 2756 |
| 302 | Organelle biogenesis | 2 | 49 | 271 | 309 |
| 302 | Developing countries | 2 | 49 | 2910 | 2783 |
| 308 | Sedimentology | 2 | 47 | 789 | 840 |
| 308 | Scandinavia | 1 | 47 | 1226 | 932 |
| 310 | Materials | 11 | 46 | 3508 | 5926 |
| 311 | Food additives | 1 | 44 | 1907 | 1808 |
| 311 | hydrocolloids | 1 | 44 | 977 | 1164 |
| 311 | energy resources | 1 | 44 | 2054 | 2353 |
| 314 | air | 3 | 43 | 156 | 302 |
| 314 | Algal blooms | 1 | 43 | 493 | 548 |
| 314 | Cyanobacteria | 1 | 43 | 493 | 548 |
| 314 | Agriculture | 3 | 43 | 2382 | 2812 |
| 314 | microalgae | 1 | 43 | 493 | 548 |
| 319 | Neurology | 1 | 42 | 7104 | 6430 |
| 320 | Computer Science | 2 | 41 | 2717 | 2344 |
| 320 | Marine Engineering | 4 | 41 | 216 | 213 |
| 320 | Naval Architecture | 4 | 41 | 271 | 352 |
| 323 | emergency management | 3 | 39 | 869 | 1259 |
| 323 | Renewable Energy Sources | 1 | 39 | 3809 | 4052 |
| 325 | concrete | 4 | 37 | 881 | 1519 |
| 326 | Urban Planning | 1 | 36 | 680 | 642 |
| 326 | Clinical Chemistry | 1 | 36 | 4236 | 4109 |
| 326 | community development | 1 | 36 | 1010 | 790 |
| 326 | Electrophoresis | 1 | 36 | 2529 | 2343 |
| 326 | Chromatography | 1 | 36 | 2595 | 2242 |
| 326 | Housing | 1 | 36 | 808 | 775 |
| 326 | Population | 1 | 36 | 1722 | 1410 |
| 326 | Chromatographic analysis | 1 | 36 | 2947 | 2413 |
| 334 | Crystallization | 2 | 35 | 691 | 582 |
| 335 | Biosensors | 2 | 34 | 1567 | 2400 |
| 335 | Soil biology | 1 | 34 | 1345 | 1522 |
| 335 | protein | 3 | 34 | 1263 | 1725 |
| 335 | Bioelectronics | 2 | 34 | 1366 | 2202 |
| 335 | Yeast | 3 | 34 | 438 | 785 |
| 340 | peer review | 1 | 33 | 158 | 89 |
| 340 | scholarly publishing | 1 | 33 | 318 | 183 |
| 342 | Stochastic Processes | 2 | 32 | 1138 | 1134 |
| 342 | Micropaleontology | 2 | 32 | 131 | 150 |
| 342 | Sustainable agriculture | 1 | 32 | 1320 | 1175 |
| 342 | Flood control | 1 | 32 | 560 | 405 |
| 342 | irrigation | 1 | 32 | 747 | 570 |
| 342 | drainage | 1 | 32 | 693 | 458 |
| 342 | Fertilizers | 3 | 32 | 340 | 632 |
| 349 | Physiology | 3 | 30 | 4079 | 5659 |
| 349 | Developmental Biology | 3 | 30 | 1954 | 3137 |
| 349 | Computational Complexity | 7 | 30 | 646 | 1325 |
| 349 | visualization | 15 | 30 | 612 | 1440 |
| 349 | polymerization | 2 | 30 | 4029 | 4314 |
| 349 | impact | 1 | 30 | 534 | 617 |
| 355 | Embryology | 2 | 29 | 1735 | 2385 |
| 355 | Freshwater Ecology | 3 | 29 | 263 | 360 |
| 355 | Aquatic animals | 3 | 29 | 196 | 352 |
| 355 | Growth | 2 | 29 | 1339 | 1984 |
| 359 | Mechanical Engineering | 4 | 28 | 2275 | 2769 |
| 359 | Information visualization | 11 | 28 | 32 | 227 |
| 359 | soil management | 1 | 28 | 925 | 1058 |
| 359 | Multiphase Flow | 4 | 28 | 306 | 713 |
| 359 | tillage | 1 | 28 | 707 | 904 |
| 359 | Entomology | 1 | 28 | 3322 | 2736 |
| 365 | Lipids | 1 | 27 | 2116 | 2346 |
| 366 | Seaweed | 2 | 26 | 661 | 998 |
| 366 | Cellulose | 1 | 26 | 1096 | 1252 |
| 366 | biological monitoring | 1 | 26 | 1006 | 1099 |
| 366 | Isotopes | 4 | 26 | 63 | 212 |
| 370 | Photography | 9 | 25 | 1550 | 1481 |
| 371 | symbiosis | 2 | 24 | 171 | 336 |
| 371 | Fracture mechanics | 2 | 24 | 1638 | 2052 |
| 371 | Radio waves | 1 | 24 | 1426 | 1444 |
| 374 | Artificial Intelligence | 9 | 23 | 2399 | 4928 |
| 374 | Cognitive Science | 9 | 23 | 769 | 2461 |
| 374 | Landslides | 1 | 23 | 482 | 655 |
| 374 | Aquaculture | 4 | 23 | 1235 | 2087 |
| 378 | Mechatronics | 2 | 22 | 1153 | 1569 |
| 378 | Plant physiology | 2 | 22 | 2309 | 3173 |
| 378 | plant molecular biology | 2 | 22 | 1706 | 2639 |
| 381 | System analysis | 4 | 21 | 2259 | 3586 |
| 381 | Middle East | 2 | 21 | 1281 | 1306 |
| 383 | greenhouse effect | 2 | 20 | 76 | 225 |
| 383 | Soil dynamics | 2 | 20 | 601 | 911 |
| 383 | Marine mineral resources | 1 | 20 | 335 | 286 |
| 383 | Carbon | 2 | 20 | 1530 | 2437 |
| 383 | Carbon dioxide | 2 | 20 | 76 | 225 |
| 383 | Tropical Medicine | 1 | 20 | 2976 | 3061 |
| 383 | Seabed | 1 | 20 | 335 | 286 |
| 390 | Metallurgy | 12 | 19 | 1222 | 3207 |
| 390 | Mechanics | 3 | 19 | 1405 | 1807 |
| 390 | amino acids | 1 | 19 | 1080 | 1317 |
| 390 | Marine algae | 1 | 19 | 257 | 297 |
| 394 | Synthetic biology | 3 | 18 | 356 | 738 |
| 395 | Metabolism | 2 | 17 | 3209 | 4998 |
| 395 | Medical Microbiology | 1 | 17 | 3408 | 4222 |
| 395 | mass transfer | 1 | 17 | 2317 | 2586 |
| 395 | Erosion | 2 | 17 | 101 | 354 |
| 395 | Water chemistry | 2 | 17 | 454 | 819 |
| 395 | Marine mammals | 1 | 17 | 455 | 533 |
| 401 | Anatomy | 2 | 16 | 2226 | 3073 |
| 401 | Morphology | 2 | 16 | 1035 | 1246 |
| 401 | Operations Research | 1 | 16 | 3054 | 3088 |
| 404 | Radio wave propagation | 3 | 15 | 903 | 1361 |
| 404 | Chemical analysis | 7 | 15 | 760 | 2231 |
| 406 | Comparative Physiology | 1 | 14 | 1161 | 1451 |
| 406 | Ocean-atmosphere interaction | 2 | 14 | 126 | 167 |
| 406 | viruses | 1 | 14 | 2165 | 2885 |
| 409 | Food Safety | 1 | 13 | 511 | 688 |
| 409 | Kinetics | 1 | 13 | 945 | 1089 |
| 409 | Chemical kinetics | 1 | 13 | 1298 | 1257 |
| 409 | food contamination | 1 | 13 | 1833 | 2116 |
| 409 | food handling | 1 | 13 | 1493 | 2102 |
| 409 | space environment | 1 | 13 | 367 | 452 |
| 409 | Chemical structure | 1 | 13 | 1030 | 1008 |
| 416 | North America | 2 | 12 | 1053 | 1646 |
| 416 | Maps | 1 | 12 | 352 | 413 |
| 416 | DNA | 5 | 12 | 429 | 1455 |
| 419 | Systems Theory | 3 | 11 | 633 | 1179 |
| 419 | Geographic information systems | 2 | 11 | 1443 | 2138 |
| 419 | Photogrammetry | 2 | 11 | 1119 | 1107 |
| 419 | Waste management | 1 | 11 | 2418 | 2789 |
| 419 | Water Purification | 1 | 11 | 2007 | 2350 |
| 419 | Social Systems | 3 | 11 | 186 | 455 |
| 419 | Water quality management | 1 | 11 | 2998 | 3434 |
| 419 | sustainability | 2 | 11 | 1124 | 2080 |
| 419 | Crystal growth | 1 | 11 | 1612 | 1913 |
| 419 | fossil | 1 | 11 | 100 | 131 |
| 419 | Trace elements | 1 | 11 | 566 | 921 |
| 430 | Cosmology | 1 | 10 | 1884 | 1802 |
| 430 | Combustion | 2 | 10 | 1446 | 2230 |
| 430 | Ichthyology | 1 | 10 | 852 | 941 |
| 430 | nuclear astrophysics | 1 | 10 | 686 | 867 |
| 430 | Turbulence | 2 | 10 | 309 | 554 |
| 430 | Bones | 1 | 10 | 1218 | 1813 |
| 436 | Thermodynamics | 2 | 9 | 1518 | 2046 |
| 436 | Manufacturing Processes | 1 | 9 | 3260 | 3786 |
| 436 | Production Engineering | 1 | 9 | 2968 | 3359 |
| 436 | Geothermal Energy | 1 | 9 | 503 | 757 |
| 436 | Hydraulic machinery | 2 | 9 | 176 | 336 |
| 436 | Entropy | 2 | 9 | 1497 | 2214 |
| 436 | Plant diseases | 1 | 9 | 2701 | 3198 |
| 443 | Histology | 1 | 8 | 2794 | 3755 |
| 443 | Signal Transduction | 1 | 8 | 2170 | 3012 |
| 443 | Cytogenetics | 1 | 8 | 2363 | 3212 |
| 443 | Biomechanics | 1 | 8 | 2403 | 2896 |
| 443 | Gene expression | 1 | 8 | 528 | 791 |
| 443 | Cell division | 1 | 8 | 1053 | 1605 |
| 443 | Detectors | 1 | 8 | 2628 | 3214 |
| 450 | Nuclear Medicine | 2 | 7 | 1229 | 1939 |
| 450 | Parallel Processing | 1 | 7 | 740 | 1081 |
| 450 | Pacific Islands | 1 | 7 | 644 | 891 |
| 450 | Metals | 2 | 7 | 2514 | 3595 |
| 454 | Synchrotron Radiation | 1 | 6 | 695 | 961 |
| 454 | Adaptive control systems | 1 | 6 | 1013 | 1357 |
| 454 | radioactive waste | 1 | 6 | 1390 | 2246 |
| 454 | industrial waste | 1 | 6 | 1430 | 2261 |
| 454 | Hazardous waste | 1 | 6 | 1604 | 2464 |
| 454 | extraterrestrial environment | 1 | 6 | 1063 | 1428 |
| 454 | astronomical phenomena | 1 | 6 | 998 | 1324 |
| 454 | Primates | 1 | 6 | 1161 | 1524 |
| 462 | Industrial Engineering | 2 | 5 | 2355 | 3867 |
| 462 | Structural Engineering | 1 | 5 | 2395 | 2964 |
| 462 | Nuclear Engineering | 2 | 5 | 1967 | 2886 |
| 462 | Nuclear Energy | 2 | 5 | 1353 | 2050 |
| 462 | Architectural Design | 1 | 5 | 830 | 1064 |
| 462 | Computer-Aided Design | 1 | 5 | 2020 | 2685 |
| 462 | Wildlife conservation | 1 | 5 | 1863 | 2646 |
| 462 | East Asia | 1 | 5 | 1230 | 1571 |
| 462 | Cement | 2 | 5 | 748 | 1355 |
| 462 | Insects | 1 | 5 | 2209 | 2804 |
| 472 | Electrical Engineering | 1 | 4 | 5141 | 5481 |
| 472 | Paleopathology | 1 | 4 | 529 | 751 |
| 472 | forestry | 1 | 4 | 442 | 724 |
| 472 | cooling | 1 | 4 | 119 | 144 |
| 472 | vapor-liquid equilibrium | 1 | 4 | 119 | 144 |
| 472 | Soviet Union | 2 | 4 | 980 | 1634 |
| 472 | Australia | 1 | 4 | 3173 | 4308 |
| 472 | aerosol | 1 | 4 | 638 | 946 |
| 480 | Ergonomics | 1 | 3 | 1624 | 2148 |
| 480 | forest policy | 1 | 3 | 639 | 1132 |
| 480 | Information Science | 1 | 3 | 3821 | 5087 |
| 483 | Probability | 1 | 2 | 1003 | 1592 |
| 483 | Risk Management | 1 | 2 | 1341 | 2222 |
| 483 | Photochemistry | 1 | 2 | 2723 | 3894 |
| 483 | Nanoparticles | 1 | 2 | 2689 | 3877 |
| 483 | Financial management | 1 | 2 | 860 | 1541 |
| 483 | Parasitology | 1 | 2 | 3395 | 4695 |
| 483 | Risk | 1 | 2 | 959 | 1581 |
| 483 | Photobiology | 1 | 2 | 2290 | 3303 |
| 483 | Parasitic Diseases | 1 | 2 | 3008 | 4381 |
| 483 | clay | 1 | 2 | 1322 | 2026 |
| 483 | Iron | 1 | 2 | 589 | 924 |
| 483 | Parasites | 1 | 2 | 2394 | 3487 |
| 495 | Pharmacy | 1 | 1 | 3316 | 4864 |
| 495 | Geometry | 1 | 1 | 1776 | 2152 |
| 495 | Algebra | 1 | 1 | 2040 | 2397 |
| 495 | soil conservation | 1 | 1 | 1396 | 2133 |
| 495 | Coatings | 1 | 1 | 135 | 218 |
| 495 | soil pollution | 1 | 1 | 1104 | 1820 |
| 495 | Food texture | 1 | 1 | 305 | 635 |
| 495 | Mitochondrial DNA | 1 | 1 | 465 | 799 |
| 495 | Vietnam | 1 | 1 | 328 | 599 |
| 495 | India | 1 | 1 | 2793 | 3758 |
| 495 | Nonlinear mechanics | 1 | 1 | 758 | 1186 |
| 506 | Plant Genetics | 1 | 0 | 1099 | 1774 |
| 506 | Plant genetic engineering | 1 | 0 | 1498 | 2292 |
| 506 | Gene expression regulation | 1 | 0 | 1657 | 2650 |
| 506 | Noise control | 1 | 0 | 602 | 658 |
| 506 | Genetic regulation | 1 | 0 | 1840 | 2837 |
| 506 | Developmental Immunology | 1 | 0 | 1380 | 2232 |
| 506 | starch | 1 | 0 | 614 | 1147 |