| 1 | Science | 50 | 14.3K | 3970 | 1606 |
| 2 | Biology | 37 | 12.6K | 4306 | 1706 |
| 3 | Physics | 10 | 11.3K | 7481 | 1968 |
| 4 | Natural history | 7 | 10.9K | 3736 | 1125 |
| 5 | Pollution | 222 | 9.7K | 465 | 581 |
| 6 | Environmental Health | 174 | 8.3K | 515 | 520 |
| 7 | Ecology | 158 | 7.1K | 882 | 984 |
| 8 | Water | 128 | 6.6K | 200 | 260 |
| 9 | Hydrology | 156 | 5.2K | 172 | 200 |
| 10 | Environmental Engineering | 105 | 5.0K | 416 | 429 |
| 11 | environmental pollution | 112 | 4.8K | 578 | 590 |
| 12 | Environment | 87 | 4.4K | 947 | 1146 |
| 13 | Microbiology | 38 | 4.1K | 2699 | 1631 |
| 14 | Public Health | 60 | 3.8K | 1459 | 940 |
| 15 | sanitation | 60 | 3.2K | 273 | 382 |
| 16 | Molecular Biology | 21 | 2.9K | 4607 | 2620 |
| 17 | Microbial Ecology | 29 | 2.8K | 794 | 571 |
| 18 | Medicine | 39 | 2.6K | 4579 | 3372 |
| 19 | Water pollution | 53 | 2.5K | 540 | 534 |
| 20 | Toxicology | 46 | 2.3K | 1496 | 1153 |
| 21 | Technology | 31 | 1.9K | 1478 | 725 |
| 22 | environmental protection | 42 | 1.9K | 795 | 721 |
| 23 | Great Lakes | 42 | 1.8K | 42 | 29 |
| 24 | Water quality management | 67 | 1.8K | 141 | 146 |
| 25 | Environmental Policy | 51 | 1.8K | 648 | 866 |
| 26 | Environmental monitoring | 56 | 1.8K | 755 | 1002 |
| 27 | water supply | 29 | 1.8K | 256 | 214 |
| 28 | Chemistry | 31 | 1.8K | 4702 | 3824 |
| 29 | hygiene | 53 | 1.6K | 21 | 29 |
| 30 | China | 20 | 1.4K | 1176 | 412 |
| 31 | Chemical Engineering | 28 | 1.4K | 1991 | 1651 |
| 32 | Environmental Chemistry | 29 | 1.3K | 560 | 732 |
| 33 | Environmental pollutants | 28 | 1.3K | 649 | 535 |
| 34 | pollutants | 27 | 1.3K | 522 | 465 |
| 35 | Analytical Chemistry | 40 | 1.3K | 1620 | 1542 |
| 36 | Environmental Geology | 29 | 1.2K | 294 | 219 |
| 37 | Biochemical Engineering | 21 | 1.0K | 1449 | 1802 |
| 38 | Environmental Microbiology | 8 | 1.0K | 934 | 533 |
| 39 | Oceanography | 28 | 1.0K | 719 | 688 |
| 40 | Research | 29 | 954 | 4398 | 4209 |
| 41 | Biotechnology | 17 | 950 | 3566 | 3037 |
| 42 | Environmental Toxicology | 29 | 917 | 697 | 941 |
| 43 | Membranes | 16 | 873 | 880 | 759 |
| 44 | Nanotechnology | 10 | 871 | 3583 | 2433 |
| 45 | Earth Sciences | 25 | 824 | 1361 | 1225 |
| 46 | water resources | 8 | 793 | 106 | 21 |
| 47 | Meteorology | 18 | 771 | 1141 | 1185 |
| 48 | Geophysics | 28 | 762 | 1633 | 1698 |
| 49 | Sustainable Development | 13 | 758 | 969 | 694 |
| 50 | Biodiversity conservation | 5 | 728 | 1641 | 1131 |
| 51 | Environmental Management | 39 | 717 | 665 | 1411 |
| 52 | freshwater biology | 13 | 704 | 416 | 266 |
| 53 | Fisheries | 13 | 702 | 946 | 604 |
| 54 | Marine Biology | 29 | 699 | 1012 | 1135 |
| 55 | Agricultural Ecology | 9 | 693 | 667 | 509 |
| 56 | Bioengineering | 12 | 692 | 2874 | 2554 |
| 57 | Aquatic ecology | 11 | 637 | 535 | 248 |
| 58 | Biochemistry | 11 | 609 | 6680 | 5316 |
| 59 | Reproduction | 8 | 601 | 1949 | 1087 |
| 60 | Sustainable agriculture | 10 | 599 | 346 | 194 |
| 61 | Planets | 15 | 581 | 943 | 1020 |
| 62 | Analytical Biochemistry | 12 | 560 | 928 | 690 |
| 63 | Geochemistry | 25 | 532 | 867 | 1148 |
| 64 | Climate change | 3 | 517 | 1261 | 1114 |
| 64 | Eutrophication | 3 | 517 | 1198 | 1109 |
| 66 | Geology | 30 | 498 | 1238 | 1500 |
| 67 | Agronomy | 3 | 493 | 627 | 282 |
| 68 | sustainability | 7 | 492 | 506 | 438 |
| 69 | Immunochemistry | 5 | 480 | 984 | 349 |
| 70 | Ecohydrology | 5 | 475 | 265 | 56 |
| 71 | United States | 31 | 467 | 1948 | 2518 |
| 72 | Economic Development | 5 | 464 | 1577 | 923 |
| 73 | Hydraulic Engineering | 25 | 442 | 260 | 368 |
| 74 | Geomorphology | 19 | 426 | 530 | 807 |
| 75 | Biogeochemical cycles | 7 | 421 | 324 | 410 |
| 76 | Chemical Oceanography | 6 | 415 | 233 | 201 |
| 77 | Soil Science | 21 | 407 | 693 | 1050 |
| 78 | Geotechnical Engineering | 1 | 405 | 1052 | 184 |
| 79 | Tropical Medicine | 1 | 390 | 3777 | 772 |
| 80 | Biomass Energy | 10 | 377 | 1597 | 1722 |
| 81 | Biophysics | 6 | 369 | 5545 | 3982 |
| 82 | Materials | 12 | 365 | 4070 | 3867 |
| 83 | Biomedical Engineering | 5 | 362 | 5125 | 3155 |
| 84 | Nutrition | 9 | 361 | 3467 | 3082 |
| 85 | Genomics | 7 | 346 | 2942 | 2452 |
| 86 | Climatology | 16 | 330 | 881 | 1210 |
| 87 | Embryology | 6 | 317 | 1456 | 1429 |
| 88 | health planning | 21 | 304 | 742 | 999 |
| 89 | Quality Control | 10 | 296 | 988 | 960 |
| 89 | Water Microbiology | 10 | 296 | 143 | 185 |
| 91 | Microelectronics | 2 | 295 | 2527 | 1341 |
| 91 | miniaturization | 2 | 295 | 2662 | 1542 |
| 93 | drinking water | 20 | 291 | 10 | 12 |
| 94 | Biosensors | 4 | 285 | 1307 | 1162 |
| 95 | Astronomy | 4 | 280 | 2928 | 2242 |
| 95 | Diet | 7 | 280 | 1837 | 1907 |
| 97 | Energy Policy | 4 | 276 | 2677 | 2219 |
| 98 | Electrochemistry | 12 | 271 | 2548 | 2504 |
| 99 | water reuse | 11 | 269 | 56 | 116 |
| 100 | energy resources | 3 | 268 | 1565 | 1373 |
| 101 | Natural resources | 8 | 267 | 479 | 514 |
| 102 | Geobiology | 11 | 259 | 221 | 287 |
| 103 | Environmental Law | 4 | 254 | 1197 | 1190 |
| 104 | Botany | 3 | 249 | 4462 | 3140 |
| 104 | Nanostructures | 1 | 249 | 4023 | 1716 |
| 106 | Chromosome mapping | 3 | 239 | 2447 | 1725 |
| 106 | gene mapping | 3 | 239 | 2682 | 2016 |
| 108 | Renewable Energy Sources | 5 | 235 | 2447 | 2693 |
| 109 | Green Chemistry | 5 | 227 | 1575 | 1620 |
| 110 | Hydrodynamics | 6 | 225 | 457 | 417 |
| 111 | environmental exposure | 8 | 223 | 1349 | 1516 |
| 112 | Civil Engineering | 9 | 222 | 1097 | 537 |
| 113 | Ichthyology | 1 | 210 | 1030 | 142 |
| 113 | Fish | 1 | 210 | 809 | 128 |
| 115 | Bioelectronics | 2 | 206 | 1599 | 1276 |
| 116 | Physiology | 5 | 203 | 4349 | 3892 |
| 116 | Cosmochemistry | 13 | 203 | 418 | 766 |
| 118 | atmospheric models | 9 | 199 | 474 | 693 |
| 119 | Meteorites | 5 | 198 | 906 | 1030 |
| 120 | Materials Science | 6 | 195 | 4265 | 3866 |
| 121 | irrigation | 12 | 194 | 125 | 156 |
| 121 | biological evolution | 4 | 194 | 2273 | 2222 |
| 123 | Sustainable Engineering | 5 | 192 | 1457 | 1432 |
| 124 | Reservoirs | 12 | 191 | 48 | 57 |
| 125 | Molecular Genetics | 3 | 186 | 2573 | 2047 |
| 126 | Biogeochemistry | 6 | 182 | 939 | 1205 |
| 126 | Host-parasite interactions | 1 | 182 | 2508 | 1751 |
| 126 | Virulence | 1 | 182 | 2272 | 1659 |
| 126 | Immunity | 1 | 182 | 3565 | 2646 |
| 130 | Solar System | 1 | 180 | 1395 | 735 |
| 131 | global environmental change | 5 | 172 | 770 | 959 |
| 132 | North America | 9 | 168 | 518 | 568 |
| 133 | Flood control | 9 | 167 | 75 | 91 |
| 134 | energy conservation | 8 | 165 | 1307 | 2039 |
| 135 | Ecosystem management | 7 | 161 | 449 | 609 |
| 136 | atmosphere | 2 | 155 | 1195 | 739 |
| 137 | Industrial Microbiology | 3 | 153 | 2381 | 2137 |
| 138 | Geographic information systems | 12 | 150 | 445 | 636 |
| 138 | environmental issues | 4 | 150 | 391 | 392 |
| 140 | Building Materials | 2 | 148 | 2179 | 1809 |
| 140 | Agriculture | 7 | 148 | 1857 | 2063 |
| 142 | Solar Energy | 3 | 147 | 1992 | 1778 |
| 143 | Biocompatible Materials | 3 | 142 | 4376 | 4287 |
| 144 | Biodiversity | 2 | 140 | 3296 | 2298 |
| 145 | Psychology | 5 | 137 | 5105 | 4724 |
| 146 | Aquaculture | 4 | 135 | 1526 | 1310 |
| 147 | Environmental Economics | 4 | 134 | 372 | 313 |
| 148 | Reproductive toxicology | 3 | 133 | 625 | 500 |
| 149 | Environmental risk assessment | 12 | 131 | 108 | 304 |
| 150 | Coastal zone management | 2 | 127 | 1015 | 643 |
| 150 | Marine resources | 2 | 127 | 1037 | 631 |
| 152 | nanoscience | 2 | 126 | 3937 | 3229 |
| 153 | Freshwater Ecology | 6 | 125 | 146 | 92 |
| 153 | environmental indicators | 5 | 125 | 995 | 1376 |
| 155 | Geography | 8 | 124 | 1712 | 2132 |
| 156 | Neurology | 2 | 123 | 7485 | 5984 |
| 157 | Metabolism | 1 | 120 | 5194 | 3698 |
| 157 | Enteral nutrition | 1 | 120 | 1931 | 1171 |
| 157 | Parenteral nutrition | 1 | 120 | 2252 | 1403 |
| 157 | drainage | 11 | 120 | 104 | 141 |
| 161 | Land use | 5 | 115 | 996 | 1239 |
| 162 | Population Genetics | 1 | 114 | 2320 | 1646 |
| 162 | Molecular ecology | 1 | 114 | 2085 | 1689 |
| 162 | Estuaries | 2 | 114 | 247 | 244 |
| 165 | Surface Chemistry | 7 | 113 | 3099 | 3934 |
| 166 | Wetland ecology | 6 | 112 | 289 | 423 |
| 166 | Wetland conservation | 6 | 112 | 192 | 285 |
| 166 | Wetlands | 6 | 112 | 196 | 285 |
| 169 | Marine Biotechnology | 3 | 109 | 266 | 282 |
| 169 | Sedimentology | 7 | 109 | 393 | 681 |
| 171 | environmental control | 11 | 108 | 68 | 255 |
| 172 | Molecular evolution | 2 | 107 | 2667 | 2190 |
| 173 | Neurobiology | 1 | 106 | 3295 | 2475 |
| 174 | Earthquake Engineering | 4 | 105 | 1224 | 1306 |
| 174 | Developmental Immunology | 1 | 105 | 1693 | 964 |
| 176 | soil management | 2 | 102 | 796 | 779 |
| 176 | tillage | 2 | 102 | 594 | 664 |
| 178 | Continental shelf | 4 | 100 | 398 | 516 |
| 179 | plankton | 2 | 99 | 330 | 243 |
| 180 | Spectrum analysis | 4 | 97 | 4583 | 4600 |
| 180 | Recycling | 3 | 97 | 660 | 1149 |
| 182 | actuators | 3 | 96 | 2539 | 2655 |
| 182 | transducers | 3 | 96 | 2539 | 2655 |
| 184 | Genetics | 3 | 95 | 5115 | 5461 |
| 185 | hazard mitigation | 4 | 93 | 886 | 1060 |
| 185 | Evolution | 5 | 93 | 1844 | 2514 |
| 185 | natural disasters | 4 | 93 | 1294 | 1554 |
| 188 | Semiconductors | 1 | 92 | 3554 | 1906 |
| 189 | Functional Genomics | 2 | 91 | 461 | 567 |
| 189 | Nanostructured Materials | 5 | 91 | 2935 | 3551 |
| 189 | genome | 2 | 91 | 2553 | 2660 |
| 192 | Pharmacology | 6 | 89 | 5184 | 6509 |
| 193 | Geodesy | 6 | 88 | 538 | 801 |
| 193 | Marine Pollution | 4 | 88 | 1219 | 1672 |
| 193 | weather | 2 | 88 | 858 | 718 |
| 196 | Atmospheric Physics | 5 | 87 | 1525 | 2006 |
| 196 | Ocean Engineering | 5 | 87 | 1447 | 1854 |
| 196 | biological monitoring | 1 | 87 | 1160 | 669 |
| 199 | Groundwater | 6 | 83 | 552 | 778 |
| 199 | Developing countries | 6 | 83 | 2044 | 2741 |
| 201 | Plant Ecology | 1 | 82 | 3025 | 2412 |
| 202 | Epidemiology | 2 | 81 | 5951 | 5124 |
| 202 | Hydrogeology | 8 | 81 | 407 | 745 |
| 202 | Dietetics | 2 | 81 | 1339 | 849 |
| 202 | Waste management | 11 | 81 | 731 | 1485 |
| 206 | Engineering | 10 | 80 | 3156 | 4411 |
| 206 | Colloids | 5 | 80 | 3471 | 4575 |
| 206 | ecosystem | 6 | 80 | 1143 | 2047 |
| 209 | Zoology | 5 | 79 | 2581 | 2652 |
| 209 | biological invasions | 4 | 79 | 636 | 842 |
| 211 | Sociology | 3 | 78 | 3813 | 3468 |
| 211 | Medical Anthropology | 3 | 78 | 1628 | 2146 |
| 213 | Nanochemistry | 3 | 75 | 1420 | 1385 |
| 214 | Forest Ecology | 1 | 72 | 1940 | 1503 |
| 214 | Heat Exchangers | 2 | 72 | 1626 | 1718 |
| 214 | Freshwater invertebrates | 1 | 72 | 453 | 363 |
| 214 | Forest Management | 1 | 72 | 1907 | 1442 |
| 218 | Global Health | 3 | 71 | 1429 | 1208 |
| 218 | Risk Management | 1 | 71 | 1698 | 945 |
| 218 | Flood forecasting | 1 | 71 | 278 | 150 |
| 221 | Endocrinology | 3 | 70 | 3985 | 4597 |
| 221 | Health | 2 | 70 | 3702 | 3171 |
| 223 | Water Purification | 10 | 69 | 603 | 1335 |
| 223 | Africa | 4 | 69 | 1730 | 1461 |
| 223 | DNA | 2 | 69 | 975 | 798 |
| 226 | Mineralogy | 2 | 66 | 1931 | 1618 |
| 226 | biofuels | 1 | 66 | 636 | 755 |
| 228 | Neurophysiology | 1 | 65 | 4962 | 4231 |
| 228 | human behavior | 1 | 65 | 4734 | 4230 |
| 228 | Behavior | 1 | 65 | 5974 | 5036 |
| 228 | Psychophysiology | 1 | 65 | 5032 | 4111 |
| 232 | Chemical analysis | 2 | 64 | 1779 | 1699 |
| 233 | Women's health | 3 | 63 | 1710 | 1862 |
| 234 | Astrophysics | 4 | 62 | 3293 | 3619 |
| 235 | Soil dynamics | 2 | 61 | 641 | 618 |
| 235 | coal | 1 | 61 | 2789 | 2500 |
| 237 | Hydrometeorology | 2 | 60 | 314 | 461 |
| 237 | Aquatic ecosystems | 4 | 60 | 143 | 170 |
| 237 | weather forecasting | 1 | 60 | 447 | 344 |
| 240 | Anatomy | 2 | 59 | 2996 | 2840 |
| 240 | Developmental Biology | 2 | 59 | 3041 | 3431 |
| 240 | soil conservation | 2 | 59 | 1166 | 1174 |
| 243 | Engineering Geology | 5 | 58 | 1244 | 1886 |
| 244 | Data Mining | 3 | 55 | 2091 | 2721 |
| 244 | Ecological Engineering | 2 | 55 | 953 | 1272 |
| 244 | Rural Development | 1 | 55 | 1261 | 765 |
| 244 | Microbial Biotechnology | 1 | 55 | 2045 | 1577 |
| 244 | data collection | 3 | 55 | 1399 | 2041 |
| 249 | land degradation | 1 | 54 | 1073 | 865 |
| 249 | degradation | 1 | 54 | 1073 | 865 |
| 251 | Information visualization | 2 | 53 | 273 | 142 |
| 251 | Animal ecology | 2 | 53 | 1689 | 1655 |
| 251 | economic policy | 3 | 53 | 3018 | 2508 |
| 251 | Geospatial data | 2 | 53 | 28 | 44 |
| 255 | Algal blooms | 2 | 52 | 448 | 638 |
| 255 | Cyanobacteria | 2 | 52 | 448 | 638 |
| 255 | microalgae | 2 | 52 | 448 | 638 |
| 258 | Marine Ecology | 3 | 51 | 901 | 1066 |
| 259 | bioclimatology | 5 | 50 | 795 | 1464 |
| 260 | Aerosols | 9 | 49 | 363 | 863 |
| 261 | Mathematics | 1 | 48 | 9290 | 6003 |
| 261 | Ultrasonics | 1 | 48 | 2097 | 1958 |
| 261 | Sonochemistry | 1 | 48 | 1226 | 1358 |
| 264 | Electronics | 2 | 47 | 4892 | 3999 |
| 264 | Comparative Physiology | 2 | 47 | 1203 | 1307 |
| 264 | Erosion | 1 | 47 | 229 | 180 |
| 267 | Chemical processes | 1 | 46 | 1299 | 872 |
| 268 | land | 2 | 45 | 91 | 35 |
| 269 | Chemical Ecology | 1 | 44 | 1032 | 1043 |
| 269 | pheromones | 1 | 44 | 957 | 998 |
| 269 | Ore deposits | 1 | 44 | 914 | 808 |
| 269 | Trace elements | 1 | 44 | 663 | 668 |
| 269 | rivers | 2 | 44 | 458 | 525 |
| 274 | Remote Sensing | 4 | 43 | 1571 | 1746 |
| 275 | Development | 2 | 42 | 1200 | 1536 |
| 275 | Economic Assistance | 2 | 42 | 1056 | 1389 |
| 277 | Pesticide residues | 2 | 41 | 104 | 234 |
| 277 | Photochemistry | 1 | 41 | 3339 | 2906 |
| 277 | Radiation | 4 | 41 | 2432 | 3169 |
| 277 | Food additives | 2 | 41 | 1772 | 2246 |
| 277 | women's rights | 2 | 41 | 298 | 336 |
| 277 | food contamination | 2 | 41 | 1633 | 1660 |
| 277 | Photobiology | 1 | 41 | 2690 | 2321 |
| 277 | Phylogeny | 1 | 41 | 1678 | 1769 |
| 285 | Clinical Chemistry | 1 | 40 | 5348 | 4976 |
| 286 | Physical Geography | 2 | 39 | 840 | 832 |
| 286 | Nuclear Chemistry | 2 | 39 | 1649 | 1381 |
| 286 | Radiochemistry | 2 | 39 | 1562 | 1243 |
| 286 | Optical materials | 1 | 39 | 4044 | 3959 |
| 290 | Mechanical Engineering | 1 | 38 | 4384 | 2941 |
| 290 | Molecular Spectroscopy | 2 | 38 | 2529 | 2800 |
| 290 | Biomass | 2 | 38 | 964 | 1547 |
| 293 | soil microbiology | 3 | 36 | 1742 | 3196 |
| 293 | Organic Geochemistry | 2 | 36 | 568 | 889 |
| 295 | Organometallic chemistry | 1 | 35 | 3301 | 2688 |
| 296 | Agricultural Chemistry | 2 | 34 | 3305 | 3884 |
| 297 | Stochastic Processes | 2 | 33 | 1328 | 1317 |
| 298 | land tenure | 1 | 32 | 170 | 166 |
| 298 | Land reform | 1 | 32 | 178 | 166 |
| 300 | Economics | 3 | 31 | 4875 | 5096 |
| 300 | health services accessibility | 2 | 31 | 1527 | 1823 |
| 300 | embryonic development | 1 | 31 | 926 | 955 |
| 303 | Genetic engineering | 1 | 30 | 4189 | 4337 |
| 303 | Atmospheric Chemistry | 3 | 30 | 1123 | 1896 |
| 303 | Reproductive health | 1 | 30 | 1723 | 1682 |
| 303 | Sexual health | 1 | 30 | 1644 | 1304 |
| 303 | Synthetic biology | 1 | 30 | 685 | 738 |
| 303 | food consumption | 1 | 30 | 182 | 213 |
| 309 | Cartography | 4 | 29 | 511 | 669 |
| 309 | Carbon | 1 | 29 | 2396 | 2723 |
| 309 | Mountains | 2 | 29 | 642 | 665 |
| 312 | Ethics | 1 | 28 | 2108 | 1633 |
| 312 | Engineering Ethics | 1 | 28 | 473 | 469 |
| 312 | Professional ethics | 1 | 28 | 659 | 626 |
| 315 | geological modeling | 2 | 27 | 775 | 984 |
| 316 | Mass Spectrometry | 2 | 26 | 1824 | 2303 |
| 317 | Optics | 1 | 25 | 7550 | 5827 |
| 317 | Energy Storage | 1 | 25 | 2210 | 2183 |
| 317 | Soil biology | 1 | 25 | 1615 | 1978 |
| 317 | Taste | 1 | 25 | 664 | 681 |
| 317 | flavor | 1 | 25 | 460 | 514 |
| 317 | smell | 1 | 25 | 664 | 681 |
| 323 | Thin Films | 1 | 24 | 1254 | 1030 |
| 323 | mass transfer | 1 | 24 | 2812 | 2899 |
| 323 | air quality | 2 | 24 | 389 | 649 |
| 326 | lakes | 3 | 23 | 75 | 196 |
| 327 | Petrology | 1 | 22 | 1475 | 1559 |
| 327 | fishing industry | 2 | 22 | 286 | 405 |
| 327 | Japan | 2 | 22 | 3180 | 3495 |
| 330 | Green Technology | 2 | 21 | 686 | 1116 |
| 330 | Watershed management | 3 | 21 | 222 | 497 |
| 330 | Entropy | 1 | 21 | 2199 | 1949 |
| 330 | toxicity testing | 1 | 21 | 1648 | 1931 |
| 334 | Soil Mechanics | 1 | 20 | 1954 | 1984 |
| 334 | Rock Mechanics | 1 | 20 | 1600 | 1671 |
| 334 | Wildlife conservation | 1 | 20 | 2218 | 2752 |
| 334 | Carcinogenesis | 1 | 20 | 2127 | 2644 |
| 334 | Antibacterial agents | 1 | 20 | 1597 | 2054 |
| 334 | Oncogenes | 1 | 20 | 2169 | 2957 |
| 334 | Algae | 2 | 20 | 1039 | 1506 |
| 334 | Seaweed | 2 | 20 | 808 | 1306 |
| 334 | Insects | 2 | 20 | 2149 | 2545 |
| 343 | India | 4 | 19 | 1893 | 2448 |
| 344 | Parasitology | 1 | 18 | 4234 | 4536 |
| 344 | Parasitic Diseases | 1 | 18 | 3929 | 4462 |
| 344 | polar regions | 2 | 18 | 1035 | 1490 |
| 344 | Earthquakes | 1 | 18 | 799 | 775 |
| 344 | energy development | 2 | 18 | 1300 | 2226 |
| 344 | Soil ecology | 1 | 18 | 1432 | 1864 |
| 350 | Fishery management | 2 | 17 | 1282 | 1807 |
| 350 | Brain | 1 | 17 | 4582 | 5211 |
| 350 | Water chemistry | 1 | 17 | 907 | 1007 |
| 353 | Proteomics | 2 | 16 | 1787 | 3058 |
| 353 | Solid State Physics | 1 | 16 | 5599 | 5690 |
| 353 | Human Geography | 2 | 16 | 1558 | 2048 |
| 353 | Input-output analysis | 1 | 16 | 577 | 670 |
| 357 | Fisheries Law | 1 | 15 | 319 | 423 |
| 357 | Product life cycle | 1 | 15 | 702 | 1007 |
| 357 | fisheries management | 1 | 15 | 319 | 423 |
| 357 | green products | 1 | 15 | 615 | 941 |
| 357 | Grasslands | 1 | 15 | 175 | 159 |
| 362 | Greenhouse gases | 1 | 14 | 735 | 1091 |
| 362 | Middle East | 1 | 14 | 2052 | 1779 |
| 362 | body temperature | 1 | 14 | 1110 | 1394 |
| 362 | Culture techniques | 1 | 14 | 696 | 803 |
| 366 | Health Policy | 1 | 13 | 5017 | 5664 |
| 366 | Public Administration | 1 | 13 | 2746 | 2525 |
| 366 | Animal Behavior | 2 | 13 | 2740 | 4341 |
| 366 | Bioremediation | 2 | 13 | 1272 | 2360 |
| 366 | Biodegradation | 1 | 13 | 1561 | 2173 |
| 366 | Ethology | 2 | 13 | 2175 | 3608 |
| 366 | administrative agencies | 1 | 13 | 606 | 610 |
| 366 | civil service | 1 | 13 | 760 | 839 |
| 374 | Regional Planning | 2 | 12 | 2201 | 3113 |
| 374 | Protozoa | 1 | 12 | 915 | 1211 |
| 374 | exobiology | 2 | 12 | 516 | 955 |
| 374 | Chromatographic analysis | 2 | 12 | 2860 | 4148 |
| 374 | Liquid chromatography | 2 | 12 | 843 | 1226 |
| 379 | Polymers | 3 | 11 | 5192 | 7717 |
| 379 | Water Conservation | 2 | 11 | 133 | 280 |
| 379 | Business | 1 | 11 | 3924 | 4282 |
| 379 | polymerization | 3 | 11 | 4404 | 6559 |
| 383 | Structural Engineering | 2 | 10 | 2217 | 3173 |
| 383 | Economic History | 1 | 10 | 6306 | 5989 |
| 383 | Travel | 1 | 10 | 2058 | 2515 |
| 383 | Solitons | 2 | 10 | 1488 | 2399 |
| 383 | Fractals | 2 | 10 | 1719 | 2611 |
| 383 | Chaos | 2 | 10 | 1488 | 2399 |
| 383 | Peasants | 1 | 10 | 222 | 349 |
| 383 | Australia | 1 | 10 | 4126 | 4634 |
| 391 | Landscape Ecology | 2 | 9 | 707 | 1479 |
| 391 | Palynology | 1 | 9 | 568 | 713 |
| 391 | Medical Microbiology | 1 | 9 | 4532 | 6002 |
| 391 | Electrochemical Analysis | 1 | 9 | 2610 | 3281 |
| 391 | Fish diseases | 1 | 9 | 287 | 492 |
| 391 | Aquatic animals | 1 | 9 | 466 | 729 |
| 391 | Invertebrates | 1 | 9 | 1327 | 1823 |
| 391 | Microorganisms | 1 | 9 | 2340 | 3387 |
| 391 | Climate | 1 | 9 | 1348 | 2008 |
| 400 | Food Science | 1 | 8 | 503 | 714 |
| 400 | Paleoclimatology | 2 | 8 | 1453 | 2406 |
| 400 | Fluid Mechanics | 2 | 8 | 2388 | 3625 |
| 400 | infrared radiation | 1 | 8 | 1286 | 1615 |
| 400 | Food | 2 | 8 | 4497 | 7111 |
| 400 | Asia | 2 | 8 | 4366 | 6313 |
| 406 | Systems Engineering | 1 | 7 | 3990 | 4501 |
| 406 | Robotics | 1 | 7 | 3008 | 3736 |
| 406 | Automation | 1 | 7 | 3237 | 3949 |
| 406 | Health Services Research | 1 | 7 | 3704 | 4929 |
| 406 | Fluid Dynamics | 1 | 7 | 2173 | 2763 |
| 406 | Control Theory | 1 | 7 | 2861 | 3275 |
| 406 | Computational Fluid Dynamics | 1 | 7 | 1329 | 1781 |
| 406 | Primary health care | 1 | 7 | 3823 | 5091 |
| 406 | Environmentalism | 1 | 7 | 317 | 550 |
| 406 | Adaptive control systems | 1 | 7 | 1145 | 1501 |
| 406 | Radioisotopes | 1 | 7 | 2501 | 2924 |
| 406 | Hazardous waste | 3 | 7 | 1058 | 2911 |
| 406 | Europe | 1 | 7 | 6532 | 7326 |
| 406 | Isotopes | 1 | 7 | 322 | 545 |
| 420 | Pediatrics | 1 | 6 | 5114 | 6511 |
| 420 | Restoration Ecology | 2 | 6 | 675 | 1458 |
| 420 | Wildlife management | 1 | 6 | 1202 | 1609 |
| 420 | city planning | 1 | 6 | 3065 | 3874 |
| 424 | Artificial Intelligence | 1 | 5 | 6405 | 7840 |
| 424 | Sleep Disorders | 1 | 5 | 3312 | 4002 |
| 424 | soil pollution | 1 | 5 | 1257 | 1910 |
| 424 | fuel cells | 1 | 5 | 2117 | 2883 |
| 424 | Birds | 1 | 5 | 2154 | 2562 |
| 424 | Sleep | 1 | 5 | 3323 | 4015 |
| 430 | Marine Geology | 1 | 4 | 1081 | 1573 |
| 430 | Marine Geophysics | 1 | 4 | 553 | 884 |
| 430 | Marine mineral resources | 1 | 4 | 347 | 555 |
| 430 | Plant breeding | 1 | 4 | 1716 | 2575 |
| 430 | Seabed | 1 | 4 | 347 | 555 |
| 430 | Protein engineering | 1 | 4 | 542 | 995 |
| 430 | molecular design | 1 | 4 | 603 | 1013 |
| 430 | Entomology | 2 | 4 | 3389 | 5151 |
| 430 | eugenics | 1 | 4 | 1457 | 2292 |
| 430 | Breeding | 1 | 4 | 2282 | 3297 |
| 440 | Social Sciences | 1 | 3 | 7122 | 8544 |
| 440 | Engineering Mathematics | 1 | 3 | 4448 | 5553 |
| 440 | emergency management | 2 | 3 | 1352 | 3178 |
| 440 | Infection control | 1 | 3 | 1626 | 2647 |
| 440 | Risk assessment | 1 | 3 | 1431 | 2420 |
| 440 | drug resistance | 1 | 3 | 1731 | 2838 |
| 440 | Plant physiology | 1 | 3 | 3487 | 4862 |
| 440 | forest policy | 1 | 3 | 808 | 1410 |
| 440 | Health Risk Assessment | 1 | 3 | 1129 | 1945 |
| 440 | Soviet Union | 1 | 3 | 1625 | 2024 |
| 440 | plant communities | 1 | 3 | 1921 | 2952 |
| 440 | Egypt | 2 | 3 | 801 | 2174 |
| 440 | Plant cells | 1 | 3 | 1930 | 2948 |
| 453 | Surveying | 2 | 2 | 245 | 595 |
| 453 | Planetary Science | 1 | 2 | 1052 | 1621 |
| 453 | Paleoecology | 1 | 2 | 1754 | 2513 |
| 453 | Marine Meteorology | 1 | 2 | 656 | 1028 |
| 453 | Photogrammetry | 2 | 2 | 1361 | 2220 |
| 453 | Paleogeography | 1 | 2 | 1567 | 2271 |
| 453 | Multiphase Flow | 1 | 2 | 730 | 1217 |
| 453 | Smart Materials | 1 | 2 | 1799 | 2745 |
| 453 | Composite Materials | 1 | 2 | 4315 | 5889 |
| 453 | Environmental Geochemistry | 1 | 2 | 1235 | 2227 |
| 453 | Plant diseases | 1 | 2 | 3322 | 4554 |
| 453 | Minerals | 1 | 2 | 1633 | 2697 |
| 465 | Phytochemistry | 1 | 1 | 709 | 1394 |
| 465 | Horticulture | 1 | 1 | 1571 | 2386 |
| 465 | Phytoremediation | 1 | 1 | 709 | 1394 |
| 465 | environmental remediation | 1 | 1 | 854 | 1640 |
| 465 | Bioreactors | 1 | 1 | 709 | 1394 |
| 465 | River Engineering | 1 | 1 | 181 | 387 |
| 465 | Societies | 1 | 1 | 417 | 666 |
| 465 | industrial waste | 1 | 1 | 1666 | 2816 |
| 465 | Molecular structure | 2 | 1 | 3580 | 6132 |
| 474 | History | 1 | 0 | 2040 | 2203 |
| 474 | Atmospheric Science | 1 | 0 | 448 | 840 |
| 474 | Electronic Packaging | 1 | 0 | 376 | 688 |
| 474 | Nonlinear Dynamics | 1 | 0 | 3431 | 4889 |
| 474 | Air Conditioning | 1 | 0 | 454 | 896 |
| 474 | Protective coatings | 1 | 0 | 393 | 846 |
| 474 | Korea | 1 | 0 | 833 | 1526 |
| 474 | Statistical physics | 1 | 0 | 5567 | 7411 |
