| 1 | Sustainable Development | 38 | 2.4K | 310 | 227 |
| 2 | Ecology | 25 | 1.9K | 3014 | 2273 |
| 3 | Environmental Management | 17 | 1.7K | 1310 | 702 |
| 4 | Environmental Policy | 16 | 1.6K | 1550 | 954 |
| 5 | Environment | 13 | 1.6K | 3178 | 2245 |
| 6 | environmental protection | 12 | 1.5K | 2088 | 867 |
| 7 | Mineral resources | 15 | 757 | 99 | 86 |
| 8 | Building Materials | 12 | 560 | 907 | 883 |
| 9 | Energy Policy | 9 | 503 | 1736 | 1582 |
| 10 | Economics | 16 | 387 | 2395 | 1964 |
| 11 | Social Change | 2 | 346 | 1390 | 651 |
| 12 | Renewable Energy Sources | 11 | 339 | 1548 | 2313 |
| 13 | Tourism | 4 | 282 | 1544 | 1090 |
| 14 | Food | 11 | 258 | 2032 | 2374 |
| 15 | finance | 11 | 257 | 1385 | 1243 |
| 16 | Biology | 7 | 236 | 9008 | 9565 |
| 17 | Social Sciences | 21 | 228 | 1515 | 1806 |
| 18 | food technology | 9 | 218 | 1753 | 2058 |
| 19 | Medicine | 10 | 210 | 9011 | 10282 |
| 20 | environmental pollution | 7 | 205 | 3745 | 4225 |
| 21 | Earth Sciences | 5 | 204 | 3148 | 2469 |
| 22 | Pollution | 7 | 185 | 4601 | 5472 |
| 23 | Quality Control | 8 | 181 | 1177 | 1355 |
| 23 | foods | 8 | 181 | 85 | 98 |
| 25 | Power Electronics | 3 | 178 | 763 | 380 |
| 26 | International Finance | 5 | 168 | 1411 | 1206 |
| 27 | China | 4 | 149 | 3107 | 2327 |
| 28 | Research | 8 | 146 | 8301 | 9661 |
| 29 | Cement | 4 | 140 | 586 | 789 |
| 30 | Economic History | 11 | 135 | 2363 | 2403 |
| 31 | Mathematics | 3 | 134 | 6904 | 4150 |
| 32 | Environmental risk assessment | 4 | 124 | 375 | 318 |
| 33 | Public Relations | 6 | 122 | 298 | 284 |
| 33 | Public Administration | 6 | 122 | 1165 | 965 |
| 35 | concrete | 2 | 118 | 1370 | 1220 |
| 36 | Environmental Toxicology | 3 | 116 | 3012 | 3110 |
| 36 | environmental control | 3 | 116 | 248 | 230 |
| 38 | Science | 5 | 112 | 11655 | 13019 |
| 39 | Horticulture | 8 | 106 | 504 | 650 |
| 40 | Financial Engineering | 3 | 102 | 193 | 165 |
| 41 | energy conservation | 5 | 93 | 1769 | 2645 |
| 42 | Molecular Biology | 4 | 92 | 8580 | 9736 |
| 43 | management | 5 | 91 | 3184 | 3566 |
| 44 | Gene expression | 7 | 89 | 162 | 371 |
| 44 | Gene expression regulation | 7 | 89 | 757 | 1430 |
| 44 | Genetic regulation | 7 | 89 | 931 | 1817 |
| 47 | Geology | 5 | 87 | 2944 | 3101 |
| 47 | environmental indicators | 2 | 87 | 1630 | 1633 |
| 49 | Genetics | 1 | 84 | 7131 | 5673 |
| 49 | Breeding | 1 | 84 | 2282 | 1493 |
| 51 | Solar Energy | 2 | 77 | 2418 | 2334 |
| 52 | Demography | 2 | 76 | 1065 | 903 |
| 52 | commerce | 2 | 76 | 2282 | 1683 |
| 54 | North America | 2 | 74 | 1449 | 1018 |
| 55 | Political Science | 2 | 72 | 2603 | 1464 |
| 56 | Asia | 4 | 68 | 3101 | 2784 |
| 57 | Landscape Ecology | 1 | 67 | 965 | 806 |
| 58 | Nutrition | 2 | 66 | 6412 | 6071 |
| 59 | Environmental Engineering | 4 | 63 | 4235 | 5396 |
| 59 | Green Technology | 5 | 63 | 278 | 510 |
| 61 | Humanities | 15 | 62 | 681 | 1434 |
| 61 | Comparative Education | 1 | 62 | 616 | 178 |
| 61 | Healing | 1 | 62 | 315 | 140 |
| 61 | Alternative Medicine | 1 | 62 | 3740 | 2589 |
| 61 | Evidence-Based Medicine | 1 | 62 | 2746 | 1696 |
| 61 | complementary therapies | 1 | 62 | 4104 | 2695 |
| 61 | Holistic Health | 1 | 62 | 1095 | 513 |
| 61 | Technology | 2 | 62 | 6389 | 5216 |
| 69 | Lymphatic system | 4 | 61 | 87 | 138 |
| 70 | Environmental Health | 5 | 60 | 5412 | 7942 |
| 71 | Electronics | 6 | 58 | 3200 | 3714 |
| 72 | Fisheries | 3 | 57 | 2033 | 2148 |
| 73 | Sociology | 14 | 55 | 1585 | 4023 |
| 73 | Physical Geography | 1 | 55 | 1199 | 710 |
| 73 | Economic Development | 4 | 55 | 1761 | 2551 |
| 73 | Geodynamics | 1 | 55 | 1451 | 1212 |
| 77 | Physics | 5 | 54 | 9386 | 12807 |
| 78 | Psychology | 6 | 53 | 4704 | 6706 |
| 79 | Electrical Engineering | 8 | 52 | 2713 | 3113 |
| 79 | United States | 3 | 52 | 7098 | 7066 |
| 81 | Aquatic ecology | 1 | 50 | 1879 | 1396 |
| 82 | Biochemistry | 4 | 49 | 9266 | 11314 |
| 82 | marketing | 1 | 49 | 3202 | 2488 |
| 84 | Education | 8 | 48 | 3044 | 4241 |
| 84 | Artificial Intelligence | 3 | 48 | 4405 | 4725 |
| 84 | international trade | 2 | 48 | 1058 | 919 |
| 87 | Pharmaceutical Chemistry | 4 | 47 | 4331 | 5763 |
| 87 | Plant diseases | 3 | 47 | 2318 | 2590 |
| 89 | Molecular Genetics | 1 | 46 | 3785 | 3604 |
| 89 | Population Genetics | 1 | 46 | 2320 | 2298 |
| 89 | Statistical Mechanics | 3 | 46 | 1443 | 1172 |
| 89 | Ichthyology | 2 | 46 | 750 | 549 |
| 89 | Drug design | 3 | 46 | 2175 | 2916 |
| 89 | economic policy | 6 | 46 | 2149 | 2646 |
| 89 | Molecular ecology | 1 | 46 | 2085 | 2322 |
| 89 | peptides | 3 | 46 | 1148 | 1298 |
| 89 | Statistical physics | 3 | 46 | 4101 | 4277 |
| 89 | Condensed Matter | 3 | 46 | 3851 | 3889 |
| 89 | Fish | 2 | 46 | 566 | 468 |
| 89 | proteins | 3 | 46 | 2724 | 3355 |
| 101 | Soil Mechanics | 3 | 45 | 1289 | 1580 |
| 102 | Business | 2 | 44 | 3073 | 3032 |
| 103 | Entrepreneurship | 2 | 41 | 1426 | 1709 |
| 103 | India | 2 | 41 | 2771 | 1588 |
| 105 | air quality | 3 | 40 | 236 | 469 |
| 106 | Operations Research | 1 | 39 | 3744 | 2921 |
| 107 | Environmental monitoring | 4 | 38 | 4217 | 6631 |
| 107 | Natural history | 1 | 38 | 7708 | 7881 |
| 109 | Food Microbiology | 1 | 37 | 2483 | 2684 |
| 110 | Wildlife conservation | 1 | 36 | 2218 | 2381 |
| 111 | Biotechnology | 7 | 35 | 5445 | 9647 |
| 111 | Learning | 2 | 35 | 2000 | 2340 |
| 113 | Methodology | 4 | 34 | 434 | 723 |
| 114 | Oral Medicine | 2 | 31 | 979 | 1000 |
| 114 | adolescence | 1 | 31 | 1815 | 1735 |
| 114 | Child welfare | 1 | 31 | 2335 | 1976 |
| 114 | Adolescent | 2 | 31 | 3449 | 3728 |
| 118 | Health Services Administration | 1 | 29 | 2610 | 2334 |
| 118 | Child psychology | 1 | 29 | 2906 | 2919 |
| 118 | Reproduction | 1 | 29 | 4386 | 4181 |
| 118 | health planning | 1 | 29 | 4267 | 3772 |
| 118 | planning | 1 | 29 | 1581 | 1282 |
| 118 | women | 2 | 29 | 1231 | 1161 |
| 124 | Civil Engineering | 2 | 28 | 2573 | 2201 |
| 124 | Obstetrics | 2 | 28 | 3907 | 4515 |
| 124 | Neonatology | 2 | 28 | 1046 | 1416 |
| 124 | Africa | 4 | 28 | 1730 | 2337 |
| 124 | computer networks | 1 | 28 | 4159 | 3509 |
| 124 | Women's health | 2 | 28 | 2158 | 2714 |
| 130 | Econometrics | 2 | 27 | 1860 | 1915 |
| 130 | energy development | 1 | 27 | 1920 | 1949 |
| 132 | Computer Vision | 1 | 26 | 2201 | 2309 |
| 132 | motivation | 1 | 26 | 661 | 711 |
| 132 | Developing countries | 3 | 26 | 3067 | 4410 |
| 135 | Automation | 3 | 25 | 2151 | 2966 |
| 135 | Numerical Analysis | 3 | 25 | 2667 | 3233 |
| 135 | Aging | 1 | 25 | 5476 | 5150 |
| 138 | Nuclear Engineering | 1 | 23 | 2367 | 1794 |
| 138 | Nuclear Energy | 1 | 23 | 2250 | 1651 |
| 138 | Nuclear Physics | 1 | 23 | 5822 | 5223 |
| 141 | Phytochemistry | 1 | 22 | 709 | 823 |
| 141 | Neural circuitry | 1 | 22 | 3411 | 3728 |
| 141 | Phytoremediation | 1 | 22 | 709 | 823 |
| 141 | environmental remediation | 1 | 22 | 854 | 945 |
| 141 | Bioreactors | 1 | 22 | 709 | 823 |
| 146 | Engineering Geology | 2 | 21 | 1925 | 2564 |
| 146 | Spine | 1 | 21 | 1413 | 1672 |
| 148 | Biomedical Engineering | 2 | 20 | 7284 | 9016 |
| 148 | Engineering Mathematics | 1 | 20 | 4448 | 3700 |
| 148 | particles | 1 | 20 | 2000 | 2128 |
| 148 | Granular materials | 1 | 20 | 1207 | 1480 |
| 152 | Organizational learning | 4 | 19 | 393 | 937 |
| 152 | monetary policy | 2 | 19 | 69 | 95 |
| 154 | Energy Storage | 1 | 18 | 2210 | 2383 |
| 154 | Soil stabilization | 1 | 18 | 137 | 148 |
| 154 | forest policy | 1 | 18 | 808 | 951 |
| 157 | Geopolitics | 2 | 17 | 413 | 572 |
| 157 | Health | 3 | 17 | 3024 | 5309 |
| 157 | natural products | 1 | 17 | 3153 | 3241 |
| 157 | biological factors | 1 | 17 | 3597 | 4093 |
| 161 | Special Education | 2 | 16 | 1158 | 1406 |
| 161 | landscapes | 2 | 16 | 279 | 542 |
| 161 | sadness | 2 | 16 | 328 | 646 |
| 161 | Latin America | 1 | 16 | 2436 | 1742 |
| 161 | Vocational guidance | 1 | 16 | 1640 | 1854 |
| 161 | death | 2 | 16 | 460 | 749 |
| 161 | Suicide | 2 | 16 | 849 | 1501 |
| 161 | antisocial personality disorder | 2 | 16 | 328 | 646 |
| 169 | Psychiatric Nursing | 3 | 15 | 795 | 1577 |
| 169 | Water pollution | 1 | 15 | 4673 | 5574 |
| 169 | Waste management | 1 | 15 | 2716 | 3040 |
| 169 | water supply | 1 | 15 | 1817 | 2276 |
| 169 | city planning | 3 | 15 | 1894 | 3191 |
| 174 | Structural Engineering | 1 | 14 | 2821 | 2954 |
| 174 | Architectural Design | 1 | 14 | 904 | 866 |
| 174 | Food service management | 1 | 14 | 758 | 1164 |
| 174 | East Asia | 1 | 14 | 1368 | 1286 |
| 174 | Plants | 2 | 14 | 2959 | 4179 |
| 179 | Public Health | 3 | 13 | 7720 | 11844 |
| 179 | Sustainable Engineering | 1 | 13 | 2907 | 3595 |
| 179 | Regional Planning | 2 | 13 | 2201 | 3068 |
| 179 | Environmental Chemistry | 1 | 13 | 4062 | 4912 |
| 179 | Malaria | 1 | 13 | 1541 | 2046 |
| 184 | Architecture | 1 | 12 | 1358 | 1006 |
| 184 | Critical theory | 1 | 12 | 379 | 365 |
| 184 | Semiotics | 1 | 12 | 784 | 487 |
| 184 | construction | 1 | 12 | 423 | 588 |
| 184 | Microscopy | 1 | 12 | 3363 | 3488 |
| 189 | Transport | 1 | 11 | 1267 | 1771 |
| 189 | Sea | 1 | 11 | 1142 | 1562 |
| 189 | Fishery resources | 1 | 11 | 1279 | 1708 |
| 192 | Wireless Communication Systems | 2 | 10 | 2764 | 3675 |
| 192 | Plant physiology | 1 | 10 | 3487 | 4452 |
| 192 | Knowledge management | 3 | 10 | 660 | 1460 |
| 192 | Drug delivery systems | 1 | 10 | 2888 | 3829 |
| 192 | Host-parasite interactions | 1 | 10 | 2508 | 3591 |
| 192 | Jurisprudence | 1 | 10 | 1951 | 2250 |
| 198 | Archaeology | 2 | 9 | 1947 | 2602 |
| 198 | Optics | 2 | 9 | 6330 | 7243 |
| 198 | Genetic engineering | 2 | 9 | 3297 | 5362 |
| 198 | Biochemical Engineering | 2 | 9 | 4549 | 7328 |
| 198 | Industrial Microbiology | 2 | 9 | 2844 | 4888 |
| 198 | Quantum electronics | 2 | 9 | 1594 | 2153 |
| 198 | Educational Psychology | 1 | 9 | 2566 | 3111 |
| 198 | Cell Biology | 1 | 9 | 6916 | 8528 |
| 198 | Developmental Biology | 1 | 9 | 3792 | 4929 |
| 198 | Energy Consumption | 1 | 9 | 523 | 879 |
| 198 | Human Capital | 1 | 9 | 604 | 852 |
| 198 | Plant tissue culture | 1 | 9 | 1421 | 1895 |
| 198 | Optoelectronic devices | 2 | 9 | 1318 | 1806 |
| 198 | Plant cell culture | 1 | 9 | 1312 | 1864 |
| 198 | lasers | 2 | 9 | 2777 | 3668 |
| 213 | Psychiatry | 2 | 8 | 6456 | 9295 |
| 213 | Computer Science | 2 | 8 | 3275 | 4689 |
| 213 | Traffic Engineering | 1 | 8 | 805 | 1198 |
| 213 | Agricultural Chemistry | 1 | 8 | 4106 | 5073 |
| 213 | Critical Care | 1 | 8 | 3277 | 4339 |
| 213 | Biomass Energy | 2 | 8 | 3418 | 5445 |
| 213 | Highway Engineering | 1 | 8 | 788 | 1054 |
| 213 | Biodiversity conservation | 1 | 8 | 2983 | 4025 |
| 213 | Plant breeding | 1 | 8 | 1716 | 2330 |
| 213 | Europe | 1 | 8 | 6532 | 7175 |
| 223 | Robotics | 1 | 7 | 3008 | 3736 |
| 223 | Pharmacognosy | 1 | 7 | 3365 | 4572 |
| 223 | Geosynthetics | 1 | 7 | 324 | 488 |
| 223 | Clinical Chemistry | 2 | 7 | 4356 | 6668 |
| 223 | Stochastic Processes | 3 | 7 | 1069 | 2191 |
| 223 | Electrophoresis | 1 | 7 | 3159 | 4247 |
| 223 | Chromatography | 1 | 7 | 3141 | 4136 |
| 223 | Nanoparticles | 1 | 7 | 3312 | 4383 |
| 223 | organization | 1 | 7 | 1423 | 1994 |
| 223 | Spectrum analysis | 1 | 7 | 6926 | 8244 |
| 223 | Chromatographic analysis | 1 | 7 | 3573 | 4534 |
| 223 | miniaturization | 1 | 7 | 3353 | 4551 |
| 235 | Pharmacology | 2 | 6 | 7617 | 11194 |
| 235 | Nanotechnology | 1 | 6 | 7759 | 9370 |
| 235 | Nursing | 2 | 6 | 2903 | 4726 |
| 235 | Optoelectronics | 1 | 6 | 1192 | 1373 |
| 235 | Molecular evolution | 1 | 6 | 3344 | 4684 |
| 235 | Fiber Optics | 1 | 6 | 1026 | 1281 |
| 235 | Library Science | 1 | 6 | 2703 | 2593 |
| 235 | ozone | 1 | 6 | 310 | 582 |
| 235 | pharmaceutical industry | 2 | 6 | 911 | 1890 |
| 244 | Radiology | 1 | 5 | 3292 | 4042 |
| 244 | Botany | 1 | 5 | 6111 | 7653 |
| 244 | Urban Planning | 1 | 5 | 802 | 1291 |
| 244 | Cloud Computing | 1 | 5 | 546 | 981 |
| 244 | Teacher Education | 1 | 5 | 111 | 244 |
| 244 | community development | 1 | 5 | 1205 | 1645 |
| 244 | Radiobiology | 1 | 5 | 3408 | 3948 |
| 244 | Housing | 1 | 5 | 956 | 1469 |
| 244 | Plant hormones | 1 | 5 | 699 | 1177 |
| 244 | medical education | 1 | 5 | 4006 | 5185 |
| 244 | plant molecular biology | 1 | 5 | 2662 | 3834 |
| 244 | drug development | 1 | 5 | 2340 | 3588 |
| 244 | drug therapy | 1 | 5 | 4650 | 6148 |
| 244 | Population | 1 | 5 | 2266 | 3041 |
| 244 | healthcare industry | 1 | 5 | 137 | 307 |
| 259 | Engineering | 1 | 4 | 8385 | 10035 |
| 259 | Neurology | 3 | 4 | 6587 | 10720 |
| 259 | Software Engineering | 1 | 4 | 1954 | 2522 |
| 259 | Applied Linguistics | 1 | 4 | 1192 | 1433 |
| 259 | Signal Processing | 2 | 4 | 2779 | 4647 |
| 259 | Developmental Neurobiology | 3 | 4 | 682 | 1777 |
| 259 | Quality of life | 1 | 4 | 3137 | 4770 |
| 259 | Middle East | 2 | 4 | 1466 | 2508 |
| 259 | Exercise | 1 | 4 | 2618 | 3395 |
| 259 | Muscle contraction | 1 | 4 | 733 | 994 |
| 269 | Toxicology | 1 | 3 | 8176 | 10577 |
| 269 | Rock Mechanics | 1 | 3 | 1600 | 2216 |
| 269 | Psychopharmacology | 1 | 3 | 3104 | 4172 |
| 269 | Image Processing | 1 | 3 | 3646 | 5025 |
| 269 | Neuropharmacology | 1 | 3 | 1262 | 1987 |
| 274 | Zoology | 1 | 2 | 4492 | 5971 |
| 274 | Dentistry | 1 | 2 | 1548 | 2157 |
| 274 | Food Science | 1 | 2 | 503 | 1031 |
| 274 | Microbiology | 1 | 2 | 10580 | 13463 |
| 274 | Urban Policy | 1 | 2 | 1536 | 2598 |
| 274 | Probability | 1 | 2 | 1264 | 2077 |
| 274 | Risk Management | 1 | 2 | 1698 | 2891 |
| 274 | Risk assessment | 1 | 2 | 1431 | 2512 |
| 274 | Financial management | 1 | 2 | 1111 | 1997 |
| 274 | Risk | 1 | 2 | 1230 | 2078 |
| 274 | Health Risk Assessment | 1 | 2 | 1129 | 2023 |
| 274 | crops | 1 | 2 | 348 | 628 |
| 286 | Mobile Computing | 1 | 1 | 2283 | 3263 |
| 286 | Political Economy | 1 | 1 | 369 | 642 |
| 286 | Health Policy | 1 | 1 | 5017 | 7461 |
| 286 | Pharmaceutical Technology | 1 | 1 | 2812 | 4217 |
| 286 | behavioral medicine | 1 | 1 | 2798 | 4681 |
| 286 | Neurophysiology | 2 | 1 | 4043 | 6885 |
| 286 | Inclusive Education | 1 | 1 | 386 | 763 |
| 286 | Transnational corporations | 1 | 1 | 756 | 1413 |
| 286 | Adhesion | 1 | 1 | 1402 | 2242 |
| 286 | peace | 1 | 1 | 965 | 1457 |
| 286 | aromatic plants | 1 | 1 | 505 | 963 |
| 286 | Integration | 1 | 1 | 369 | 749 |
| 286 | Germany | 1 | 1 | 1605 | 2247 |
| 286 | Cerebellum | 2 | 1 | 468 | 1263 |
| 286 | adhesives | 1 | 1 | 1485 | 2320 |
| 286 | United Kingdom | 1 | 1 | 3402 | 4980 |
| 286 | Cognition | 3 | 1 | 2006 | 4680 |
| 286 | Cerebellar ataxia | 2 | 1 | 468 | 1263 |
| 304 | Epidemiology | 1 | 0 | 7453 | 10523 |
| 304 | Pediatrics | 1 | 0 | 5114 | 7434 |
| 304 | Child | 1 | 0 | 4987 | 7262 |
| 304 | Mental Disorders | 1 | 0 | 5863 | 8386 |
| 304 | Religion | 1 | 0 | 2034 | 2489 |
| 304 | Cognitive Therapy | 1 | 0 | 1289 | 2247 |
| 304 | Ultrasonics | 1 | 0 | 2097 | 3339 |
| 304 | Family | 1 | 0 | 1900 | 3269 |
| 304 | Eastern Europe | 1 | 0 | 2010 | 3042 |
| 304 | families | 1 | 0 | 1684 | 2872 |
| 304 | Ultrasonic Imaging | 1 | 0 | 1114 | 1952 |
| 304 | Communist countries | 1 | 0 | 588 | 1089 |
| 304 | refugees | 1 | 0 | 591 | 1093 |
| 304 | behavior therapy | 1 | 0 | 1645 | 2694 |
| 304 | psychotherapy | 1 | 0 | 2607 | 4046 |
| 304 | Ultrasound | 1 | 0 | 1163 | 2011 |
