| # | Discipline | Articles | Citations | R ARank | R CRank |
|---|
| 1 | Pollution | 2,214 | 108,935 | 7 | 8 |
| 2 | Environmental Health | 1,152 | 74,953 | 20 | 16 |
| 3 | Geophysics | 982 | 58,938 | 88 | 51 |
| 4 | Environmental Engineering | 849 | 55,231 | 12 | 15 |
| 5 | environmental pollution | 1,436 | 55,024 | 7 | 8 |
| 6 | sanitation | 623 | 46,959 | 9 | 11 |
| 7 | Atmospheric Physics | 712 | 43,080 | 26 | 21 |
| 8 | Ecology | 851 | 42,731 | 138 | 190 |
| 9 | Meteorology | 743 | 40,760 | 25 | 25 |
| 10 | Atmospheric Chemistry | 565 | 34,078 | 11 | 15 |
| 11 | Biology | 212 | 33,411 | 1.4K | 777 |
| 12 | Toxicology | 723 | 29,839 | 39 | 26 |
| 13 | Science | 237 | 27,357 | 1.3K | 954 |
| 14 | Physics | 84 | 26,308 | 2.7K | 1.0K |
| 15 | Environment | 314 | 26,066 | 205 | 161 |
| 16 | Environmental pollutants | 610 | 25,327 | 4 | 3 |
| 17 | Climatology | 370 | 23,933 | 40 | 29 |
| 18 | pollutants | 533 | 22,334 | 4 | 3 |
| 19 | Environmental Chemistry | 546 | 21,808 | 5 | 18 |
| 20 | Environmental monitoring | 477 | 18,051 | 18 | 21 |
| 21 | Natural history | 119 | 16,673 | 544 | 797 |
| 22 | Hydrology | 364 | 15,438 | 40 | 41 |
| 23 | Planets | 237 | 15,191 | 145 | 98 |
| 24 | Environmental Toxicology | 278 | 13,780 | 26 | 29 |
| 25 | environmental protection | 204 | 12,644 | 63 | 41 |
| 26 | Chemistry | 90 | 11,520 | 2.7K | 1.3K |
| 27 | Earth Sciences | 90 | 10,665 | 369 | 80 |
| 28 | Oceanography | 287 | 10,040 | 47 | 66 |
| 29 | Water pollution | 213 | 7,699 | 50 | 88 |
| 30 | atmospheric models | 198 | 7,353 | 17 | 37 |
| 31 | Biodiversity conservation | 120 | 6,830 | 121 | 204 |
| 32 | Birds | 373 | 6,285 | 14 | 26 |
| 33 | Medicine | 147 | 5,996 | 2.1K | 2.0K |
| 34 | Marine Biology | 170 | 5,782 | 165 | 152 |
| 35 | Climate change | 57 | 5,338 | 157 | 202 |
| 35 | Eutrophication | 57 | 5,338 | 152 | 201 |
| 37 | Research | 128 | 5,309 | 1.8K | 1.4K |
| 38 | Microbiology | 83 | 5,150 | 1.7K | 1.3K |
| 39 | atmosphere | 175 | 4,866 | 8 | 3 |
| 40 | Water | 122 | 4,864 | 127 | 187 |
| 41 | ecosystem | 119 | 4,470 | 33 | 85 |
| 42 | Biodiversity | 109 | 4,325 | 190 | 195 |
| 43 | Environmental Policy | 77 | 4,211 | 270 | 243 |
| 44 | Microbial Ecology | 70 | 4,194 | 393 | 408 |
| 45 | Zoology | 161 | 4,159 | 147 | 138 |
| 46 | Analytical Chemistry | 131 | 3,891 | 608 | 602 |
| 47 | Ornithology | 228 | 3,669 | 15 | 32 |
| 48 | Environmental Law | 54 | 3,654 | 71 | 72 |
| 49 | Agricultural Ecology | 100 | 3,543 | 61 | 103 |
| 50 | toxicity testing | 70 | 3,221 | 23 | 19 |
| 51 | Technology | 64 | 3,150 | 690 | 396 |
| 52 | water supply | 55 | 3,126 | 165 | 128 |
| 53 | Environmental Management | 98 | 3,034 | 116 | 219 |
| 54 | Biogeochemistry | 59 | 2,961 | 126 | 154 |
| 55 | Aquatic ecology | 126 | 2,907 | 13 | 16 |
| 56 | Marine Pollution | 63 | 2,887 | 36 | 45 |
| 57 | Water quality management | 119 | 2,638 | 58 | 79 |
| 58 | environmental exposure | 60 | 2,451 | 165 | 111 |
| 59 | Geology | 65 | 2,441 | 653 | 454 |
| 60 | Environmental risk assessment | 70 | 2,434 | 4 | 10 |
| 61 | environmental control | 64 | 2,323 | 3 | 10 |
| 62 | Hydrometeorology | 49 | 2,311 | 12 | 26 |
| 63 | biological evolution | 19 | 2,050 | 906 | 586 |
| 64 | Animal ecology | 61 | 2,039 | 171 | 198 |
| 65 | California | 88 | 1,967 | 22 | 27 |
| 66 | cryosphere | 55 | 1,942 | 33 | 55 |
| 67 | Parasitology | 49 | 1,900 | 528 | 327 |
| 68 | Evolution | 27 | 1,898 | 665 | 537 |
| 69 | Waste management | 77 | 1,894 | 65 | 62 |
| 70 | biological monitoring | 66 | 1,842 | 5 | 11 |
| 71 | Botany | 65 | 1,813 | 939 | 1.1K |
| 72 | Biogeochemical cycles | 23 | 1,793 | 133 | 131 |
| 73 | Water Purification | 72 | 1,792 | 54 | 60 |
| 74 | Mass Spectrometry | 36 | 1,709 | 317 | 205 |
| 75 | Molecular Biology | 29 | 1,681 | 4.0K | 3.3K |
| 76 | freshwater biology | 42 | 1,636 | 102 | 105 |
| 77 | Ecosystem management | 85 | 1,620 | 13 | 74 |
| 78 | Fisheries | 56 | 1,610 | 170 | 167 |
| 79 | Agriculture | 34 | 1,522 | 504 | 329 |
| 80 | Molecular ecology | 20 | 1,443 | 470 | 392 |
| 81 | Conservation Biology | 31 | 1,442 | 206 | 234 |
| 82 | Parasitic Diseases | 29 | 1,429 | 616 | 423 |
| 83 | Risk assessment | 36 | 1,314 | 17 | 7 |
| 84 | polar regions | 64 | 1,271 | 52 | 65 |
| 85 | Health Risk Assessment | 34 | 1,215 | 11 | 5 |
| 86 | ecological risk assessment | 33 | 1,210 | 6 | 3 |
| 87 | Molecular Genetics | 17 | 1,202 | 905 | 636 |
| 88 | Pharmacology | 55 | 1,195 | 1.6K | 1.9K |
| 89 | Geography | 30 | 1,179 | 675 | 459 |
| 90 | Geobiology | 25 | 1,164 | 92 | 43 |
| 91 | Great Lakes | 35 | 1,126 | 10 | 7 |
| 92 | Population Genetics | 25 | 1,125 | 421 | 440 |
| 93 | Epidemiology | 20 | 1,122 | 2.0K | 1.3K |
| 94 | Hydraulic Engineering | 40 | 1,047 | 100 | 74 |
| 95 | Data Mining | 14 | 1,046 | 589 | 318 |
| 95 | data collection | 14 | 1,046 | 329 | 218 |
| 97 | global environmental change | 21 | 1,044 | 170 | 155 |
| 98 | Landscape Ecology | 24 | 978 | 79 | 94 |
| 99 | Parasites | 15 | 967 | 644 | 267 |
| 100 | geological modeling | 35 | 944 | 58 | 92 |
| 101 | Geochemical Modeling | 33 | 939 | 56 | 90 |
| 101 | weather | 12 | 939 | 139 | 39 |
| 103 | Entomology | 37 | 915 | 693 | 556 |
| 104 | Agricultural Chemistry | 48 | 898 | 555 | 796 |
| 105 | Algae | 15 | 868 | 358 | 211 |
| 106 | Hypertension | 3 | 857 | 2.5K | 1.3K |
| 107 | Groundwater | 31 | 856 | 145 | 109 |
| 108 | Water Conservation | 47 | 854 | 2 | 1 |
| 109 | bioclimatology | 21 | 852 | 177 | 131 |
| 109 | Radioisotopes | 16 | 852 | 360 | 65 |
| 109 | Isotopes | 16 | 852 | 8 | 1 |
| 112 | food contamination | 41 | 808 | 91 | 84 |
| 113 | Wetland ecology | 23 | 804 | 67 | 59 |
| 114 | Biogeography | 13 | 792 | 520 | 492 |
| 115 | Soil Science | 21 | 755 | 513 | 443 |
| 116 | Algal blooms | 8 | 753 | 74 | 63 |
| 116 | Cyanobacteria | 8 | 753 | 74 | 63 |
| 116 | microalgae | 8 | 753 | 74 | 63 |
| 119 | Aerosols | 14 | 740 | 125 | 92 |
| 120 | Cardiovascular system | 2 | 725 | 2.8K | 1.5K |
| 121 | Biochemistry | 20 | 700 | 5.1K | 4.4K |
| 122 | Aquatic ecosystems | 53 | 692 | 8 | 6 |
| 123 | Wildlife management | 26 | 685 | 99 | 77 |
| 124 | Radiation | 15 | 682 | 788 | 409 |
| 125 | Chromatography | 29 | 680 | 387 | 352 |
| 126 | disease vectors | 4 | 677 | 1.1K | 238 |
| 127 | Public Health | 18 | 667 | 3.2K | 2.6K |
| 128 | Remote Sensing | 44 | 663 | 56 | 127 |
| 129 | Genetics | 12 | 651 | 2.7K | 2.6K |
| 130 | weather forecasting | 29 | 647 | 23 | 35 |
| 131 | Paleoclimatology | 2 | 608 | 967 | 172 |
| 132 | Plant Ecology | 20 | 606 | 591 | 770 |
| 133 | Wetland conservation | 19 | 601 | 62 | 62 |
| 133 | Wetlands | 19 | 601 | 62 | 62 |
| 135 | Scandinavia | 33 | 598 | 94 | 148 |
| 136 | Health | 9 | 571 | 1.7K | 889 |
| 137 | Glaciology | 33 | 560 | 66 | 97 |
| 137 | glaciers | 33 | 560 | 62 | 97 |
| 139 | Chromatographic analysis | 24 | 555 | 613 | 518 |
| 140 | Climate | 13 | 535 | 129 | 115 |
| 141 | Environmental forensics | 15 | 534 | 5 | 2 |
| 142 | Seaweed | 11 | 533 | 320 | 265 |
| 143 | Hydrogeology | 12 | 519 | 289 | 126 |
| 144 | Pesticides | 34 | 502 | 47 | 64 |
| 145 | Spectrum analysis | 14 | 499 | 2.3K | 1.8K |
| 146 | Civil Engineering | 25 | 497 | 425 | 192 |
| 147 | Wildlife conservation | 33 | 494 | 108 | 265 |
| 148 | natural disasters | 21 | 493 | 300 | 412 |
| 149 | Virulence | 5 | 485 | 1.2K | 989 |
| 150 | Environmental Microbiology | 9 | 480 | 859 | 822 |
| 151 | Analytical Biochemistry | 16 | 472 | 537 | 492 |
| 152 | Biotechnology | 14 | 451 | 3.9K | 4.1K |
| 153 | Host-parasite interactions | 4 | 431 | 1.3K | 1.1K |
| 153 | Immunity | 4 | 431 | 2.3K | 1.9K |
| 155 | Computational Biology | 6 | 408 | 2.9K | 1.7K |
| 156 | Nanotechnology | 6 | 407 | 4.5K | 3.3K |
| 157 | Virology | 4 | 388 | 3.6K | 2.9K |
| 157 | environmental issues | 7 | 388 | 239 | 118 |
| 159 | Endocrinology | 8 | 382 | 2.7K | 2.4K |
| 160 | Geochemistry | 20 | 375 | 601 | 676 |
| 160 | Electrophoresis | 18 | 375 | 677 | 799 |
| 160 | United States | 18 | 375 | 2.8K | 2.7K |
| 160 | Zoonoses | 1 | 375 | 759 | 90 |
| 164 | soil pollution | 21 | 366 | 67 | 117 |
| 165 | Marine Meteorology | 19 | 359 | 97 | 156 |
| 166 | soil conservation | 17 | 342 | 197 | 307 |
| 167 | Biomass Energy | 4 | 334 | 2.1K | 1.4K |
| 168 | Horticulture | 3 | 333 | 966 | 216 |
| 169 | Pesticide residues | 7 | 306 | 22 | 35 |
| 169 | Food additives | 7 | 306 | 628 | 458 |
| 171 | Chemical Engineering | 12 | 300 | 2.5K | 2.6K |
| 172 | Marine Ecology | 21 | 298 | 169 | 271 |
| 173 | air quality | 9 | 290 | 40 | 44 |
| 173 | Australia | 3 | 290 | 2.4K | 777 |
| 175 | China | 19 | 288 | 1.1K | 1.1K |
| 176 | Animal Behavior | 14 | 280 | 834 | 1.3K |
| 176 | Nuclear Chemistry | 17 | 280 | 376 | 338 |
| 176 | Radiochemistry | 17 | 280 | 431 | 373 |
| 176 | Carbon | 4 | 280 | 752 | 551 |
| 180 | Bioremediation | 6 | 276 | 297 | 217 |
| 181 | Stochastic Processes | 10 | 275 | 448 | 304 |
| 182 | radiative transfer | 2 | 273 | 328 | 62 |
| 183 | Climate Change Mitigation | 4 | 270 | 22 | 54 |
| 183 | Global warming | 4 | 270 | 22 | 54 |
| 183 | sea level | 4 | 270 | 22 | 54 |
| 186 | hazard mitigation | 14 | 265 | 272 | 435 |
| 187 | Cytology | 3 | 260 | 5.2K | 4.0K |
| 188 | rivers | 14 | 257 | 74 | 133 |
| 189 | environmental indicators | 10 | 253 | 116 | 269 |
| 190 | Structure-activity relationship | 6 | 249 | 264 | 219 |
| 191 | Breeding | 1 | 244 | 2.4K | 871 |
| 192 | Cell Biology | 2 | 235 | 5.9K | 4.2K |
| 193 | Environmental Geology | 8 | 221 | 814 | 733 |
| 194 | Physiology | 7 | 219 | 3.7K | 3.6K |
| 194 | Biomedical Engineering | 5 | 219 | 5.0K | 3.7K |
| 196 | Urban Policy | 9 | 218 | 203 | 274 |
| 196 | urban forestry | 9 | 218 | 72 | 95 |
| 198 | Ethology | 11 | 216 | 681 | 1.2K |
| 199 | biological invasions | 3 | 209 | 740 | 423 |
| 200 | government | 6 | 205 | 506 | 354 |
| 201 | Fluid Mechanics | 9 | 204 | 1.4K | 1.2K |
| 202 | wetland management | 4 | 203 | 130 | 77 |
| 203 | Reproduction | 4 | 198 | 2.6K | 1.9K |
| 204 | Ecohydrology | 13 | 196 | 58 | 161 |
| 205 | animals | 11 | 186 | 824 | 772 |
| 206 | forestry | 10 | 185 | 112 | 135 |
| 207 | Cosmochemistry | 12 | 182 | 120 | 186 |
| 208 | occupational diseases | 3 | 173 | 1.3K | 772 |
| 209 | Molecular evolution | 3 | 167 | 1.8K | 1.5K |
| 209 | Phylogeny | 3 | 167 | 1.0K | 714 |
| 211 | Sustainable agriculture | 2 | 166 | 984 | 468 |
| 212 | Photochemistry | 3 | 165 | 1.8K | 1.1K |
| 212 | Plant physiology | 4 | 165 | 2.1K | 2.0K |
| 214 | Agronomy | 4 | 164 | 573 | 521 |
| 215 | Freshwater invertebrates | 6 | 157 | 39 | 123 |
| 216 | Epigenetics | 4 | 152 | 181 | 98 |
| 216 | Critical Care | 1 | 152 | 3.5K | 2.3K |
| 216 | Critical Care Medicine | 1 | 152 | 3.0K | 2.2K |
| 216 | Epigenomics | 4 | 152 | 177 | 95 |
| 220 | Infections | 2 | 151 | 1.9K | 1.5K |
| 220 | infection | 2 | 151 | 2.5K | 1.7K |
| 222 | Chemical Ecology | 3 | 149 | 666 | 560 |
| 222 | pheromones | 3 | 149 | 605 | 527 |
| 224 | emergency management | 4 | 148 | 847 | 533 |
| 225 | Photobiology | 1 | 147 | 2.0K | 678 |
| 226 | Biochemical Engineering | 2 | 146 | 3.6K | 3.3K |
| 227 | Risk Management | 3 | 144 | 853 | 565 |
| 228 | city planning | 3 | 143 | 1.6K | 986 |
| 229 | wildlife diseases | 6 | 142 | 50 | 37 |
| 230 | water resources | 5 | 141 | 164 | 100 |
| 231 | Plant diseases | 5 | 140 | 1.8K | 1.6K |
| 232 | mammals | 10 | 139 | 602 | 842 |
| 233 | Geomorphology | 4 | 138 | 867 | 813 |
| 233 | Surface Chemistry | 4 | 138 | 3.3K | 3.0K |
| 233 | Colloids | 4 | 138 | 3.3K | 3.2K |
| 236 | Water chemistry | 3 | 135 | 375 | 174 |
| 237 | Hemodynamics | 1 | 132 | 1.6K | 1.2K |
| 237 | soil microbiology | 4 | 132 | 1.3K | 1.7K |
| 239 | energy resources | 7 | 131 | 368 | 973 |
| 240 | Engineering | 19 | 129 | 1.8K | 3.0K |
| 241 | Reservoirs | 8 | 126 | 79 | 91 |
| 242 | Fertilizers | 3 | 125 | 440 | 348 |
| 243 | Aquaculture | 6 | 124 | 853 | 783 |
| 244 | Energy Policy | 6 | 122 | 1.2K | 1.8K |
| 245 | Water Microbiology | 5 | 117 | 337 | 447 |
| 246 | Chemical analysis | 3 | 111 | 1.6K | 1.3K |
| 247 | plant communities | 4 | 110 | 1.1K | 1.4K |
| 248 | Embryology | 2 | 108 | 2.4K | 2.2K |
| 249 | Flood forecasting | 1 | 106 | 269 | 68 |
| 249 | Flood control | 1 | 106 | 648 | 133 |
| 249 | coal | 6 | 106 | 427 | 832 |
| 252 | Restoration Ecology | 5 | 104 | 355 | 455 |
| 253 | Quality Control | 5 | 103 | 1.3K | 1.3K |
| 253 | Social behavior | 5 | 103 | 982 | 1.3K |
| 255 | Sustainable Development | 5 | 102 | 1.6K | 1.9K |
| 255 | Municipal Engineering | 5 | 102 | 200 | 268 |
| 257 | Numerical Analysis | 5 | 100 | 2.0K | 1.6K |
| 258 | Technology Assessment | 2 | 99 | 219 | 190 |
| 258 | Bacteriology | 2 | 99 | 2.5K | 2.3K |
| 258 | bats | 5 | 99 | 56 | 47 |
| 258 | Cost effectiveness | 2 | 99 | 118 | 56 |
| 258 | Decision making | 3 | 99 | 1.9K | 1.4K |
| 263 | Immunology | 2 | 98 | 5.4K | 4.7K |
| 263 | Wind power | 10 | 98 | 86 | 214 |
| 263 | Product life cycle | 3 | 98 | 346 | 389 |
| 263 | green products | 3 | 98 | 314 | 380 |
| 267 | mycoses | 1 | 97 | 1.9K | 1.4K |
| 267 | Bacterial infections | 1 | 97 | 1.9K | 1.4K |
| 269 | Neurology | 4 | 96 | 6.0K | 6.4K |
| 269 | Environmental Geochemistry | 6 | 96 | 308 | 439 |
| 271 | transgenic organisms | 4 | 94 | 241 | 382 |
| 272 | Lipids | 3 | 93 | 1.7K | 1.8K |
| 273 | Neurotoxicology | 2 | 92 | 826 | 668 |
| 274 | Transportation Engineering | 1 | 91 | 732 | 315 |
| 275 | Ecological Genetics | 11 | 90 | 261 | 559 |
| 276 | Genetic Toxicology | 3 | 89 | 427 | 570 |
| 277 | North America | 9 | 87 | 342 | 601 |
| 278 | Mycology | 5 | 86 | 1.5K | 1.7K |
| 279 | Physical Geography | 10 | 85 | 245 | 489 |
| 280 | Proteomics | 7 | 83 | 836 | 1.7K |
| 281 | mutation | 2 | 82 | 690 | 687 |
| 282 | Genetic markers | 3 | 81 | 323 | 272 |
| 282 | biochemical markers | 3 | 81 | 1.1K | 928 |
| 284 | Engineering Geology | 4 | 80 | 1.2K | 1.3K |
| 284 | natural products | 3 | 80 | 2.3K | 1.9K |
| 284 | biological factors | 3 | 80 | 2.6K | 2.4K |
| 284 | winds | 7 | 80 | 29 | 46 |
| 288 | environmental remediation | 3 | 78 | 394 | 385 |
| 288 | Animal migration | 8 | 78 | 1 | 1 |
| 290 | Statistics | 8 | 76 | 2.0K | 2.5K |
| 290 | herbicides | 1 | 76 | 730 | 420 |
| 292 | Nanoparticles | 2 | 75 | 2.7K | 2.3K |
| 292 | Fishery resources | 4 | 75 | 285 | 425 |
| 292 | miniaturization | 2 | 75 | 2.8K | 2.8K |
| 295 | Transport | 3 | 72 | 395 | 562 |
| 295 | Sea | 3 | 72 | 287 | 392 |
| 295 | ozone | 1 | 72 | 329 | 103 |
| 298 | plankton | 4 | 71 | 195 | 297 |
| 298 | Insects | 4 | 71 | 1.5K | 1.4K |
| 298 | Cancer | 2 | 71 | 5.5K | 5.1K |
| 301 | Emerging infectious diseases | 2 | 70 | 558 | 538 |
| 302 | Ocean Engineering | 4 | 69 | 883 | 1.0K |
| 303 | Genetically modified organisms | 2 | 68 | 32 | 30 |
| 303 | safety | 2 | 68 | 140 | 82 |
| 305 | Genomics | 7 | 67 | 2.9K | 4.8K |
| 305 | Forest Ecology | 6 | 67 | 418 | 769 |
| 305 | Forest Management | 6 | 67 | 366 | 574 |
| 308 | Natural resources | 3 | 66 | 732 | 843 |
| 309 | Watershed management | 3 | 63 | 214 | 156 |
| 310 | Optics | 7 | 62 | 3.9K | 4.2K |
| 310 | Tourism | 1 | 62 | 2.4K | 1.6K |
| 310 | Primary health care | 1 | 62 | 3.8K | 2.3K |
| 313 | Materials Science | 1 | 61 | 7.6K | 5.5K |
| 313 | Biocompatible Materials | 1 | 61 | 6.1K | 5.3K |
| 313 | Materials | 1 | 61 | 8.3K | 6.4K |
| 316 | Mathematics | 4 | 59 | 6.0K | 4.8K |
| 316 | Pediatrics | 1 | 59 | 5.1K | 4.0K |
| 316 | Cartography | 3 | 59 | 519 | 353 |
| 316 | Industrial Microbiology | 4 | 59 | 2.1K | 3.1K |
| 316 | Geodesy | 3 | 59 | 683 | 611 |
| 321 | Fishery management | 3 | 58 | 840 | 791 |
| 322 | Coastal zone management | 7 | 57 | 208 | 567 |
| 322 | human behavior | 2 | 57 | 3.2K | 3.6K |
| 322 | Behavior | 2 | 57 | 4.4K | 4.6K |
| 322 | sexual behavior | 2 | 57 | 890 | 844 |
| 322 | Psychophysiology | 2 | 57 | 3.7K | 3.9K |
| 327 | Ecological Engineering | 2 | 56 | 415 | 524 |
| 327 | greenhouse effect | 3 | 56 | 66 | 109 |
| 327 | radiocarbon dating | 3 | 56 | 425 | 413 |
| 327 | Intelligent Control Systems | 1 | 56 | 2.3K | 938 |
| 327 | Carbon dioxide | 3 | 56 | 66 | 109 |
| 327 | Fuzzy systems | 1 | 56 | 3.0K | 1.5K |
| 327 | Marine mammals | 5 | 56 | 260 | 423 |
| 334 | Anthropology | 1 | 55 | 3.2K | 1.7K |
| 334 | Human evolution | 1 | 55 | 751 | 603 |
| 336 | Physical Chemistry | 4 | 54 | 2.6K | 3.2K |
| 336 | Landslides | 1 | 54 | 555 | 464 |
| 338 | food technology | 3 | 53 | 2.6K | 3.1K |
| 338 | DNA | 2 | 53 | 1.0K | 883 |
| 340 | Paleontology | 2 | 52 | 1.9K | 1.6K |
| 341 | Hydrodynamics | 2 | 51 | 548 | 505 |
| 342 | Biophysics | 4 | 50 | 6.4K | 7.3K |
| 343 | Comparative Physiology | 3 | 49 | 809 | 1.1K |
| 344 | Population | 3 | 48 | 1.1K | 1.3K |
| 345 | System analysis | 4 | 47 | 2.4K | 2.8K |
| 346 | Food Microbiology | 2 | 46 | 1.8K | 2.3K |
| 346 | Foodborne diseases | 2 | 46 | 421 | 501 |
| 346 | Minerals | 2 | 46 | 1.1K | 1.1K |
| 349 | lakes | 2 | 44 | 122 | 84 |
| 349 | Chemical industry | 4 | 44 | 1.4K | 1.6K |
| 351 | industrial waste | 3 | 43 | 789 | 1.7K |
| 352 | Clinical Immunology | 1 | 41 | 2.4K | 2.1K |
| 352 | Industrial Safety | 1 | 41 | 2.1K | 1.2K |
| 354 | Mineralogy | 1 | 40 | 2.5K | 1.9K |
| 354 | radioactive waste | 1 | 40 | 1.3K | 1.7K |
| 354 | Hazardous waste | 1 | 40 | 1.6K | 1.8K |
| 354 | Ore deposits | 1 | 40 | 679 | 614 |
| 358 | Antarctica | 1 | 39 | 662 | 350 |
| 359 | Probability | 3 | 38 | 926 | 1.2K |
| 359 | Geographic information systems | 6 | 38 | 794 | 1.4K |
| 359 | peer review | 2 | 38 | 106 | 71 |
| 359 | Financial management | 2 | 38 | 821 | 1.1K |
| 359 | Risk | 3 | 38 | 708 | 1.1K |
| 359 | scholarly publishing | 2 | 38 | 201 | 165 |
| 365 | air | 2 | 36 | 46 | 120 |
| 366 | Solar power plants | 1 | 35 | 499 | 515 |
| 366 | Photovoltaic Cells | 1 | 35 | 503 | 516 |
| 366 | solar cells | 1 | 35 | 1.0K | 1.1K |
| 366 | Liquid chromatography | 3 | 35 | 649 | 682 |
| 370 | Engineering Mathematics | 1 | 34 | 4.6K | 2.9K |
| 370 | Systems Biology | 2 | 34 | 2.6K | 2.9K |
| 370 | Greenhouse gases | 3 | 34 | 213 | 473 |
| 370 | scientific research | 4 | 34 | 45 | 84 |
| 374 | Herpetology | 3 | 32 | 353 | 356 |
| 374 | Reptiles | 3 | 32 | 349 | 323 |
| 376 | Systems Theory | 2 | 30 | 885 | 702 |
| 376 | Biological Systems | 2 | 30 | 1.1K | 1.4K |
| 376 | drug toxicity | 2 | 30 | 553 | 961 |
| 379 | Bioengineering | 1 | 29 | 7.4K | 7.3K |
| 379 | Biosensors | 1 | 29 | 2.1K | 2.7K |
| 379 | Paleopathology | 1 | 29 | 655 | 478 |
| 379 | Bioelectronics | 1 | 29 | 1.8K | 2.4K |
| 383 | Transportation | 2 | 28 | 1.9K | 2.1K |
| 383 | ports | 3 | 28 | 198 | 405 |
| 383 | Waterways | 3 | 28 | 79 | 134 |
| 383 | Harbors | 3 | 28 | 102 | 163 |
| 383 | Roads | 2 | 28 | 992 | 948 |
| 388 | Marine resources | 2 | 27 | 542 | 803 |
| 389 | Mechanical Engineering | 2 | 26 | 3.3K | 2.9K |
| 389 | Geotechnical Engineering | 1 | 26 | 902 | 852 |
| 389 | Soil Mechanics | 1 | 26 | 1.6K | 1.4K |
| 389 | Plant genetic engineering | 2 | 26 | 1.4K | 2.0K |
| 389 | transgenic animals | 2 | 26 | 409 | 803 |
| 389 | Ultrasonics | 1 | 26 | 2.0K | 2.2K |
| 389 | Sonochemistry | 1 | 26 | 1.0K | 1.4K |
| 389 | Transgenic plants | 2 | 26 | 771 | 1.3K |
| 389 | Microscopy | 3 | 26 | 2.5K | 2.6K |
| 398 | Environmental Ethics | 2 | 25 | 239 | 235 |
| 398 | Renewable Energy Sources | 1 | 25 | 3.4K | 3.9K |
| 398 | Continental shelf | 3 | 25 | 122 | 316 |
| 401 | Polymers | 1 | 24 | 7.1K | 6.5K |
| 401 | Sedimentology | 4 | 24 | 663 | 1.4K |
| 403 | Computational Fluid Dynamics | 2 | 23 | 675 | 813 |
| 403 | forest policy | 1 | 23 | 553 | 544 |
| 403 | venom | 1 | 23 | 1.1K | 1.3K |
| 403 | Toxins | 1 | 23 | 1.3K | 1.4K |
| 407 | structural stability | 2 | 21 | 525 | 765 |
| 407 | Plants | 4 | 21 | 2.4K | 4.0K |
| 409 | Microbial Biotechnology | 2 | 20 | 1.6K | 2.3K |
| 409 | Ocean-atmosphere interaction | 2 | 20 | 145 | 126 |
| 409 | Soil biology | 1 | 20 | 977 | 1.3K |
| 409 | Soil fertility | 1 | 20 | 719 | 980 |
| 409 | Soil ecology | 1 | 20 | 952 | 1.3K |
| 414 | Medical Laboratory Science | 1 | 19 | 4.5K | 4.9K |
| 414 | Sustainable Engineering | 2 | 19 | 2.3K | 3.3K |
| 414 | Estuaries | 1 | 19 | 349 | 480 |
| 417 | Evolutionary Genetics | 1 | 18 | 1.4K | 1.6K |
| 417 | Molecular Epidemiology | 1 | 18 | 1.4K | 1.6K |
| 417 | Light | 2 | 18 | 1.6K | 2.5K |
| 417 | South America | 2 | 18 | 165 | 115 |
| 417 | gene mapping | 1 | 18 | 4.0K | 4.8K |
| 417 | DNA polymerases | 1 | 18 | 1.0K | 1.6K |
| 423 | Computer Science | 1 | 17 | 4.1K | 3.4K |
| 423 | Petroleum Engineering | 8 | 17 | 421 | 1.2K |
| 423 | Public Policy | 2 | 17 | 2.4K | 3.6K |
| 423 | Systems Analysis | 2 | 17 | 1.6K | 2.2K |
| 423 | Marine sediments | 2 | 17 | 46 | 42 |
| 428 | soil management | 3 | 16 | 381 | 953 |
| 428 | Bioacoustics | 4 | 16 | 70 | 258 |
| 428 | Neural circuitry | 1 | 16 | 2.9K | 3.3K |
| 428 | sustainability | 2 | 16 | 1.2K | 1.9K |
| 428 | drainage | 2 | 16 | 418 | 567 |
| 428 | Nervous system | 1 | 16 | 4.5K | 5.3K |
| 428 | Mountains | 8 | 16 | 178 | 763 |
| 428 | Amphibians | 2 | 16 | 423 | 401 |
| 436 | Industrial Engineering | 3 | 15 | 2.4K | 3.8K |
| 436 | Biodegradation | 1 | 15 | 1.1K | 1.5K |
| 436 | Developing countries | 2 | 15 | 2.8K | 4.0K |
| 436 | Fouling | 1 | 15 | 616 | 900 |
| 436 | Meteorites | 1 | 15 | 946 | 1.2K |
| 441 | Astrophysics | 2 | 14 | 3.7K | 4.3K |
| 441 | Fluid Dynamics | 3 | 14 | 1.1K | 1.9K |
| 441 | Developmental Biology | 1 | 14 | 3.7K | 4.5K |
| 441 | Organometallic chemistry | 1 | 14 | 2.8K | 3.0K |
| 441 | economic policy | 2 | 14 | 3.3K | 3.5K |
| 441 | Organometallic compounds | 1 | 14 | 2.2K | 2.5K |
| 447 | Helminthology | 2 | 13 | 205 | 276 |
| 447 | Respiratory Infections | 1 | 13 | 903 | 1.1K |
| 447 | Tropical Medicine | 1 | 13 | 3.6K | 4.0K |
| 447 | Helminths | 2 | 13 | 205 | 276 |
| 447 | Influenza | 1 | 13 | 789 | 979 |
| 452 | History | 7 | 12 | 909 | 1.1K |
| 452 | Photography | 4 | 12 | 1.6K | 1.6K |
| 452 | Phytochemistry | 1 | 12 | 719 | 982 |
| 452 | Ichthyology | 3 | 12 | 614 | 1.0K |
| 452 | Phytoremediation | 1 | 12 | 719 | 982 |
| 452 | Bioreactors | 1 | 12 | 719 | 982 |
| 452 | Solutions | 1 | 12 | 817 | 878 |
| 452 | Petroleum | 6 | 12 | 219 | 647 |
| 452 | natural gas | 6 | 12 | 231 | 807 |
| 452 | Fish | 3 | 12 | 462 | 872 |
| 462 | Freshwater Ecology | 2 | 11 | 433 | 750 |
| 462 | Nanostructured Materials | 1 | 11 | 5.2K | 6.0K |
| 462 | Nanostructures | 1 | 11 | 3.9K | 4.5K |
| 462 | International Finance | 1 | 11 | 2.1K | 2.3K |
| 462 | Latin America | 1 | 11 | 2.7K | 1.9K |
| 462 | Asia | 4 | 11 | 2.7K | 5.1K |
| 462 | animal diseases | 3 | 11 | 579 | 1.4K |
| 462 | tillage | 1 | 11 | 299 | 609 |
| 470 | Atmospheric Science | 3 | 10 | 125 | 288 |
| 470 | Korea | 3 | 10 | 368 | 744 |
| 470 | Biometrics | 2 | 10 | 1.7K | 2.5K |
| 470 | Invertebrates | 1 | 10 | 949 | 1.3K |
| 470 | Mollusks | 1 | 10 | 542 | 539 |
| 475 | Economic Development | 2 | 9 | 2.1K | 3.4K |
| 475 | Fluorescence | 1 | 9 | 940 | 1.2K |
| 477 | Economic History | 2 | 8 | 4.8K | 5.5K |
| 477 | Image Processing | 2 | 8 | 2.8K | 4.1K |
| 477 | X-ray spectroscopy | 4 | 8 | 205 | 709 |
| 480 | Clinical Chemistry | 2 | 7 | 4.0K | 6.2K |
| 480 | Solar Energy | 1 | 7 | 1.9K | 2.7K |
| 480 | Water quality | 1 | 7 | 671 | 1.1K |
| 480 | clay | 1 | 7 | 998 | 1.6K |
| 480 | clay minerals | 1 | 7 | 622 | 937 |
| 480 | Chromosomes | 1 | 7 | 1.6K | 2.4K |
| 480 | Europe | 3 | 7 | 4.3K | 6.8K |
| 487 | Environmental Education | 1 | 6 | 805 | 1.1K |
| 488 | Human Geography | 3 | 5 | 1.2K | 2.4K |
| 488 | Environmental Economics | 2 | 5 | 566 | 1.3K |
| 488 | Mathematical Physics | 1 | 5 | 4.6K | 4.5K |
| 488 | Periglacial processes | 1 | 5 | 286 | 504 |
| 488 | Reproductive toxicology | 2 | 5 | 538 | 1.4K |
| 488 | Permafrost | 1 | 5 | 286 | 504 |
| 488 | Frozen ground | 1 | 5 | 291 | 507 |
| 488 | Africa | 1 | 5 | 3.3K | 3.7K |
| 496 | Molecular Pharmacology | 1 | 4 | 1.8K | 2.8K |
| 496 | Global Health | 1 | 4 | 2.6K | 3.4K |
| 496 | Electronics | 1 | 4 | 6.4K | 7.3K |
| 496 | Development Economics | 1 | 4 | 1.1K | 1.6K |
| 496 | Signal Processing | 1 | 4 | 3.9K | 5.1K |
| 496 | health services accessibility | 1 | 4 | 2.0K | 2.6K |
| 496 | Marine invertebrates | 1 | 4 | 566 | 816 |
| 496 | Freeze-Drying | 1 | 4 | 596 | 1.1K |
| 496 | Hypothermia | 1 | 4 | 596 | 1.1K |
| 496 | Entropy | 1 | 4 | 2.4K | 3.1K |
| 496 | Freeze Drying | 1 | 4 | 596 | 1.1K |
| 496 | Erosion | 1 | 4 | 73 | 296 |
| 496 | international trade | 1 | 4 | 1.3K | 1.7K |
| 496 | International Business | 1 | 4 | 532 | 856 |
| 496 | commerce | 1 | 4 | 2.6K | 3.1K |
| 496 | Imaging systems | 1 | 4 | 1.4K | 1.7K |
| 496 | energy development | 1 | 4 | 1.7K | 2.6K |
| 496 | Development | 1 | 4 | 1.4K | 2.1K |
| 514 | Computer Graphics | 1 | 3 | 2.6K | 3.6K |
| 514 | Plant Pathology | 1 | 3 | 382 | 611 |
| 514 | Radiation Protection | 1 | 3 | 1.5K | 1.9K |
| 514 | industrial hygiene | 2 | 3 | 1.9K | 3.5K |
| 514 | France | 1 | 3 | 897 | 976 |
| 514 | disaster relief | 1 | 3 | 474 | 911 |
| 514 | Eigenvalues | 1 | 3 | 428 | 379 |
| 514 | Genes | 1 | 3 | 2.4K | 3.6K |
| 522 | Social Sciences | 1 | 2 | 7.1K | 8.4K |
| 522 | Sociology | 1 | 2 | 5.6K | 7.3K |
| 522 | Neuropsychology | 1 | 2 | 4.0K | 5.6K |
| 522 | Neurobiology | 1 | 2 | 3.1K | 4.4K |
| 522 | occupational health and safety | 1 | 2 | 567 | 908 |
| 522 | air quality management | 1 | 2 | 854 | 1.7K |
| 522 | Neurophysiology | 1 | 2 | 4.6K | 6.3K |
| 522 | Carcinogenesis | 1 | 2 | 2.1K | 3.2K |
| 522 | Crisis management | 1 | 2 | 407 | 695 |
| 522 | Environmental carcinogens | 1 | 2 | 91 | 250 |
| 522 | Developmental Neurobiology | 1 | 2 | 1.3K | 1.9K |
| 522 | civilization | 2 | 2 | 1.9K | 2.0K |
| 522 | Brain | 1 | 2 | 4.0K | 5.5K |
| 522 | indoor air pollution | 1 | 2 | 943 | 1.7K |
| 522 | Quality of life | 1 | 2 | 3.2K | 5.0K |
| 522 | Ventilation | 1 | 2 | 1.2K | 2.1K |
| 522 | Japan | 3 | 2 | 2.6K | 5.1K |
| 522 | Sick building syndrome | 1 | 2 | 943 | 1.7K |
| 522 | investigative techniques | 1 | 2 | 322 | 733 |
| 541 | Game Theory | 2 | 1 | 653 | 1.5K |
| 541 | Surveying | 3 | 1 | 154 | 572 |
| 541 | Nuclear Energy | 1 | 1 | 1.9K | 2.5K |
| 541 | Human genetics | 1 | 1 | 4.2K | 6.0K |
| 541 | Occupational Health | 1 | 1 | 2.7K | 3.8K |
| 541 | Organic Chemistry | 1 | 1 | 4.9K | 6.4K |
| 541 | Demography | 1 | 1 | 1.5K | 2.4K |
| 541 | Regional Planning | 1 | 1 | 2.8K | 4.0K |
| 541 | Medical Microbiology | 1 | 1 | 4.5K | 6.5K |
| 541 | Library Science | 1 | 1 | 2.6K | 3.3K |
| 541 | libraries | 1 | 1 | 1.5K | 1.7K |
| 541 | Sociobiology | 1 | 1 | 416 | 756 |
| 541 | scientific societies | 1 | 1 | 1.7K | 3.0K |
| 541 | Geospatial data | 1 | 1 | 67 | 274 |
| 541 | social aspects | 1 | 1 | 188 | 386 |
| 541 | synthesis | 1 | 1 | 2.0K | 2.9K |
| 541 | Human biology | 1 | 1 | 1.4K | 2.4K |
| 541 | international cooperation | 2 | 1 | 922 | 2.3K |
| 541 | eugenics | 1 | 1 | 1.7K | 2.8K |
| 541 | Birth control | 1 | 1 | 1.1K | 2.0K |
| 561 | Literature | 1 | 0 | 1.6K | 1.6K |
| 561 | Philosophy | 1 | 0 | 2.8K | 3.3K |
| 561 | Planetary Science | 1 | 0 | 948 | 1.5K |
| 561 | Animal Biotechnology | 1 | 0 | 453 | 932 |
| 561 | Acoustics | 1 | 0 | 746 | 1.2K |
| 561 | Dance | 1 | 0 | 600 | 855 |
| 561 | History of Medicine | 1 | 0 | 1.1K | 1.4K |
| 561 | Biotelemetry | 1 | 0 | 193 | 387 |
| 561 | Animal breeding | 1 | 0 | 1.3K | 2.0K |
| 561 | Green Technology | 2 | 0 | 612 | 2.0K |
| 561 | Sound | 1 | 0 | 2.1K | 3.2K |
| 561 | probabilities | 1 | 0 | 2.1K | 2.8K |
| 561 | Radiometry | 3 | 0 | 175 | 432 |
| 561 | Endocrine system | 1 | 0 | 1.9K | 1.8K |
| 561 | recreation | 1 | 0 | 1.3K | 2.1K |
