| 1 | Physics | 10 | 506 | 7522 | 7474 |
| 2 | Data Mining | 5 | 454 | 1487 | 817 |
| 3 | Renewable Energy Sources | 11 | 446 | 1556 | 2059 |
| 4 | Artificial Intelligence | 6 | 425 | 3350 | 1867 |
| 5 | Environmental Health | 21 | 408 | 2718 | 3852 |
| 5 | Science | 21 | 408 | 6401 | 8902 |
| 7 | Cognitive Science | 1 | 386 | 2933 | 879 |
| 7 | China | 5 | 386 | 2862 | 1308 |
| 9 | Access to Information | 4 | 371 | 86 | 74 |
| 9 | big data | 4 | 371 | 441 | 119 |
| 9 | Information dissemination | 4 | 371 | 86 | 74 |
| 12 | Agricultural systems | 3 | 350 | 380 | 204 |
| 13 | Computer Science | 6 | 327 | 1860 | 737 |
| 14 | Engineering | 22 | 308 | 1913 | 2153 |
| 15 | Ecology | 9 | 288 | 5056 | 5742 |
| 16 | Public Health | 22 | 284 | 2848 | 4526 |
| 17 | Developing countries | 15 | 269 | 1102 | 1444 |
| 18 | Biology | 8 | 261 | 8634 | 9396 |
| 19 | Medicine | 30 | 234 | 5396 | 10003 |
| 20 | Environmental Policy | 15 | 231 | 1639 | 3119 |
| 21 | Natural history | 1 | 226 | 7713 | 6051 |
| 22 | Environment | 8 | 221 | 4142 | 5788 |
| 23 | Sustainable Development | 13 | 208 | 981 | 1728 |
| 23 | Earth Sciences | 15 | 208 | 1832 | 2467 |
| 25 | Environmental Management | 11 | 202 | 1799 | 2932 |
| 26 | Solitons | 2 | 200 | 1540 | 639 |
| 26 | Fractals | 2 | 200 | 1779 | 712 |
| 26 | Chaos | 2 | 200 | 1540 | 639 |
| 29 | Mathematics | 16 | 194 | 3756 | 3607 |
| 30 | Information Science | 4 | 189 | 2689 | 2048 |
| 31 | biomedicine | 4 | 176 | 921 | 625 |
| 31 | Research | 19 | 176 | 5626 | 9111 |
| 33 | Technology | 12 | 160 | 2768 | 3543 |
| 34 | environmental pollution | 5 | 153 | 4391 | 4795 |
| 35 | environmental protection | 5 | 141 | 3528 | 3786 |
| 36 | Pollution | 6 | 126 | 4983 | 6311 |
| 37 | Land use | 3 | 125 | 1348 | 1193 |
| 38 | occupational diseases | 7 | 121 | 691 | 1080 |
| 39 | Computational Biology | 5 | 115 | 3079 | 3223 |
| 40 | Africa | 23 | 112 | 479 | 1070 |
| 40 | energy development | 3 | 112 | 1000 | 1035 |
| 42 | Geophysics | 4 | 109 | 3834 | 3735 |
| 43 | Environmental Engineering | 7 | 104 | 3262 | 4560 |
| 44 | Social Sciences | 13 | 103 | 2121 | 2935 |
| 44 | System analysis | 6 | 103 | 2180 | 2339 |
| 46 | Economic History | 13 | 100 | 2167 | 2814 |
| 47 | Restoration Ecology | 1 | 91 | 969 | 535 |
| 48 | Agriculture | 12 | 88 | 1326 | 2640 |
| 49 | Atmospheric Physics | 1 | 87 | 2831 | 2027 |
| 50 | Chemistry | 7 | 86 | 8463 | 11312 |
| 50 | food technology | 3 | 86 | 3068 | 3241 |
| 52 | Social welfare | 2 | 83 | 861 | 556 |
| 52 | Bioinformatics | 1 | 83 | 3997 | 2732 |
| 52 | Social work | 2 | 83 | 2220 | 1308 |
| 55 | Dynamics | 3 | 82 | 2255 | 1631 |
| 56 | Business Ethics | 2 | 81 | 1234 | 1402 |
| 57 | infrared radiation | 1 | 77 | 1306 | 530 |
| 58 | Food | 5 | 73 | 3116 | 4265 |
| 58 | forest policy | 3 | 73 | 413 | 435 |
| 60 | Transportation | 3 | 71 | 1948 | 1937 |
| 61 | community development | 2 | 70 | 845 | 645 |
| 62 | Energy Policy | 5 | 69 | 2472 | 4030 |
| 62 | Fisheries | 4 | 69 | 1776 | 1985 |
| 64 | management | 14 | 67 | 1894 | 4119 |
| 65 | Education | 9 | 66 | 2899 | 3753 |
| 65 | Tourism | 3 | 66 | 1832 | 2166 |
| 67 | Quality Control | 4 | 65 | 1932 | 2458 |
| 68 | energy conservation | 4 | 64 | 2051 | 3121 |
| 69 | Business | 12 | 62 | 1231 | 2773 |
| 70 | city planning | 4 | 61 | 1640 | 1969 |
| 71 | Urban Policy | 3 | 57 | 886 | 1225 |
| 71 | energy resources | 2 | 57 | 1929 | 2679 |
| 73 | population geography | 1 | 55 | 832 | 543 |
| 73 | Entomology | 6 | 55 | 2136 | 2677 |
| 75 | Economic Development | 7 | 53 | 1298 | 2625 |
| 75 | Research Design | 1 | 53 | 2726 | 2075 |
| 77 | Waste management | 3 | 51 | 1671 | 1895 |
| 77 | global environmental change | 2 | 51 | 1276 | 1664 |
| 79 | Sociology | 3 | 50 | 3881 | 4258 |
| 79 | Water | 7 | 50 | 2005 | 4219 |
| 79 | Mineral resources | 3 | 50 | 665 | 1072 |
| 82 | Information Theory | 1 | 47 | 2242 | 1603 |
| 83 | Botany | 4 | 46 | 4089 | 5499 |
| 83 | Human Geography | 4 | 46 | 1084 | 1392 |
| 85 | Hydrology | 6 | 45 | 2241 | 3571 |
| 86 | Economics | 9 | 44 | 3210 | 4686 |
| 86 | Microbiology | 4 | 44 | 7316 | 10053 |
| 86 | Public Relations | 1 | 44 | 1009 | 610 |
| 86 | Public Administration | 1 | 44 | 2781 | 1648 |
| 86 | drinking water | 4 | 44 | 94 | 138 |
| 86 | health planning | 5 | 44 | 2127 | 3263 |
| 86 | hygiene | 4 | 44 | 492 | 973 |
| 86 | Aquaculture | 3 | 44 | 1734 | 2097 |
| 94 | Transport | 2 | 43 | 921 | 1191 |
| 94 | Sea | 2 | 43 | 828 | 1023 |
| 94 | Fishery resources | 2 | 43 | 931 | 1122 |
| 97 | Epidemiology | 4 | 42 | 4479 | 6539 |
| 97 | Plant Ecology | 4 | 42 | 1841 | 2998 |
| 97 | food handling | 1 | 42 | 1812 | 1834 |
| 100 | Combustion | 3 | 40 | 1447 | 1949 |
| 100 | Tropical Medicine | 4 | 40 | 2106 | 3030 |
| 102 | Humanities | 2 | 38 | 2898 | 2010 |
| 102 | Municipal Engineering | 1 | 38 | 893 | 713 |
| 104 | Parasitology | 5 | 37 | 2406 | 3725 |
| 104 | Parasitic Diseases | 5 | 37 | 2104 | 3748 |
| 106 | Solar Energy | 2 | 36 | 2440 | 3142 |
| 107 | Development | 3 | 34 | 955 | 1669 |
| 108 | Technological Innovations | 1 | 33 | 2142 | 1908 |
| 109 | shellfish | 1 | 32 | 401 | 326 |
| 109 | finance | 7 | 32 | 1828 | 3119 |
| 111 | Industrial Engineering | 5 | 31 | 1757 | 3183 |
| 111 | Environmental monitoring | 5 | 31 | 3875 | 7062 |
| 113 | Medical Technology | 2 | 30 | 3006 | 3765 |
| 113 | Biomedical Engineering | 2 | 30 | 7366 | 8317 |
| 113 | water reuse | 2 | 30 | 452 | 743 |
| 113 | Parasites | 4 | 30 | 1757 | 2887 |
| 113 | Fuzzy systems | 5 | 30 | 1564 | 2374 |
| 118 | Chemical Engineering | 3 | 29 | 5227 | 6862 |
| 118 | Molecular Genetics | 1 | 29 | 3800 | 4073 |
| 118 | Travel | 5 | 29 | 775 | 1684 |
| 118 | Molecular evolution | 1 | 29 | 3365 | 3579 |
| 118 | geological modeling | 3 | 29 | 604 | 963 |
| 118 | biological evolution | 1 | 29 | 3942 | 4323 |
| 118 | India | 5 | 29 | 1646 | 2006 |
| 118 | Phylogeny | 1 | 29 | 1684 | 1971 |
| 126 | Agronomy | 4 | 28 | 468 | 1261 |
| 126 | Plant diseases | 5 | 28 | 1846 | 3053 |
| 128 | Materials Science | 5 | 26 | 4618 | 7014 |
| 128 | Information Technology | 4 | 26 | 2736 | 3932 |
| 128 | Urban Planning | 1 | 26 | 812 | 872 |
| 128 | Soil Science | 3 | 26 | 2191 | 3300 |
| 128 | Geographic information systems | 3 | 26 | 1309 | 1860 |
| 128 | Housing | 1 | 26 | 959 | 1013 |
| 128 | Population | 1 | 26 | 2275 | 2016 |
| 128 | Economic Assistance | 2 | 26 | 1054 | 1670 |
| 136 | Computer Vision | 1 | 25 | 2226 | 2355 |
| 136 | Industrial Microbiology | 1 | 25 | 3696 | 4178 |
| 136 | Image Processing | 1 | 25 | 3705 | 3568 |
| 136 | Microbial Biotechnology | 1 | 25 | 2047 | 2231 |
| 136 | sanitation | 1 | 25 | 2888 | 3691 |
| 136 | Yeast | 1 | 25 | 918 | 1018 |
| 136 | Women's health | 3 | 25 | 1705 | 2880 |
| 143 | Geology | 3 | 23 | 3578 | 4718 |
| 144 | Astrophysics | 3 | 22 | 3619 | 4625 |
| 144 | Hydraulic Engineering | 1 | 22 | 1795 | 1740 |
| 144 | Geochemistry | 3 | 22 | 2327 | 3743 |
| 144 | Coastal zone management | 1 | 22 | 1391 | 1587 |
| 144 | Geodesy | 3 | 22 | 902 | 1531 |
| 149 | Geography | 6 | 21 | 1994 | 4105 |
| 149 | Neural circuitry | 1 | 21 | 3503 | 3882 |
| 149 | Intelligent Control Systems | 4 | 21 | 1163 | 1809 |
| 149 | sustainable forestry | 2 | 21 | 170 | 227 |
| 153 | Malaria | 2 | 20 | 1122 | 1820 |
| 153 | plant communities | 2 | 20 | 1504 | 2397 |
| 155 | Ecological Genetics | 3 | 19 | 784 | 1364 |
| 155 | Engineering Mathematics | 6 | 19 | 2251 | 3868 |
| 155 | Health Services Research | 2 | 19 | 2823 | 3980 |
| 155 | Agricultural Ecology | 2 | 19 | 1680 | 2832 |
| 155 | Conservation Biology | 3 | 19 | 1410 | 2579 |
| 155 | Population Genetics | 3 | 19 | 1496 | 2841 |
| 155 | Primary health care | 2 | 19 | 2868 | 4137 |
| 155 | agricultural policy | 2 | 19 | 360 | 837 |
| 155 | hazard mitigation | 1 | 19 | 1923 | 2247 |
| 155 | Middle East | 2 | 19 | 1480 | 1609 |
| 155 | natural disasters | 1 | 19 | 2501 | 2893 |
| 155 | Biodiversity | 3 | 19 | 2826 | 4561 |
| 167 | Nutrition | 1 | 18 | 8001 | 8674 |
| 167 | Applied Mathematics | 4 | 18 | 992 | 1196 |
| 167 | Sustainable agriculture | 1 | 18 | 1600 | 1790 |
| 167 | sustainability | 2 | 18 | 1206 | 2148 |
| 167 | Entrepreneurship | 2 | 18 | 1456 | 2194 |
| 167 | food consumption | 1 | 18 | 176 | 280 |
| 167 | natural products | 1 | 18 | 3167 | 3206 |
| 167 | biological factors | 1 | 18 | 3626 | 4074 |
| 175 | Catalysis | 1 | 17 | 5124 | 5644 |
| 175 | Food Policy | 1 | 17 | 758 | 1074 |
| 175 | Fishery management | 1 | 17 | 1682 | 1805 |
| 175 | Ecosystem management | 3 | 17 | 790 | 1661 |
| 175 | Food Security | 2 | 17 | 244 | 652 |
| 175 | United Kingdom | 1 | 17 | 3375 | 3689 |
| 175 | world | 1 | 17 | 1498 | 2092 |
| 182 | Environmental Toxicology | 1 | 16 | 4588 | 5626 |
| 182 | foods | 1 | 16 | 675 | 836 |
| 182 | disease vectors | 2 | 16 | 1448 | 2535 |
| 182 | environmental issues | 1 | 16 | 969 | 1309 |
| 186 | Geriatrics | 1 | 15 | 5888 | 6047 |
| 186 | Natural resources | 1 | 15 | 1548 | 1870 |
| 186 | Gerontology | 1 | 15 | 3984 | 3953 |
| 189 | Biomass Energy | 1 | 14 | 4328 | 5163 |
| 189 | Animal health | 3 | 14 | 534 | 932 |
| 189 | environmental indicators | 1 | 14 | 2137 | 3007 |
| 189 | adolescence | 2 | 14 | 1334 | 2252 |
| 189 | Adolescent Psychology | 2 | 14 | 1273 | 2086 |
| 189 | Environmental Geochemistry | 2 | 14 | 829 | 1606 |
| 189 | Adolescent | 2 | 14 | 3485 | 4845 |
| 189 | Biomass | 1 | 14 | 1366 | 2106 |
| 189 | Youth | 2 | 14 | 937 | 1639 |
| 189 | Minerals | 2 | 14 | 1174 | 2030 |
| 199 | Water pollution | 2 | 13 | 3781 | 5737 |
| 199 | Health equity | 1 | 13 | 165 | 194 |
| 199 | Simulation Methods | 3 | 13 | 1142 | 2336 |
| 199 | urban health | 1 | 13 | 650 | 1000 |
| 199 | water supply | 2 | 13 | 1374 | 2371 |
| 204 | Mining Geology | 1 | 12 | 218 | 236 |
| 204 | Signal Processing | 1 | 12 | 3586 | 3980 |
| 204 | Quality of life | 1 | 12 | 3173 | 4218 |
| 204 | food industry | 2 | 12 | 1033 | 1836 |
| 208 | Information Systems | 1 | 11 | 3101 | 3780 |
| 208 | Agricultural Chemistry | 1 | 11 | 4125 | 4894 |
| 208 | Forest Ecology | 1 | 11 | 1933 | 2602 |
| 208 | reforestation | 2 | 11 | 234 | 515 |
| 208 | Pest control | 1 | 11 | 358 | 466 |
| 208 | Forest Management | 1 | 11 | 1888 | 2466 |
| 208 | Pesticides | 1 | 11 | 1420 | 1868 |
| 208 | afforestation | 2 | 11 | 234 | 515 |
| 208 | probabilities | 2 | 11 | 1738 | 2016 |
| 217 | Biotechnology | 2 | 10 | 8521 | 12006 |
| 217 | Public Policy | 2 | 10 | 2757 | 4798 |
| 217 | Systems Analysis | 2 | 10 | 1645 | 2839 |
| 217 | Food Preservation | 1 | 10 | 1579 | 1921 |
| 217 | economic policy | 4 | 10 | 2651 | 4471 |
| 217 | food contamination | 1 | 10 | 2203 | 2749 |
| 217 | Multimedia Systems | 1 | 10 | 3217 | 3455 |
| 217 | breastfeeding | 1 | 10 | 1215 | 1718 |
| 225 | Animal Nutrition | 1 | 9 | 1100 | 1450 |
| 225 | poverty | 1 | 9 | 1014 | 1520 |
| 225 | healthcare disparities | 1 | 9 | 1206 | 1739 |
| 225 | Socioeconomic Factors | 1 | 9 | 1745 | 2646 |
| 225 | Plants | 1 | 9 | 3720 | 4533 |
| 230 | Electrical Engineering | 2 | 8 | 4842 | 5615 |
| 230 | Oceanography | 2 | 8 | 2498 | 4002 |
| 230 | Pediatrics | 1 | 8 | 5156 | 6364 |
| 230 | Human Rights | 1 | 8 | 1235 | 1493 |
| 230 | Total Quality Management | 1 | 8 | 1215 | 1749 |
| 230 | Technology Assessment | 1 | 8 | 859 | 1590 |
| 230 | Computational Intelligence | 2 | 8 | 1514 | 2530 |
| 230 | Small Business | 1 | 8 | 1362 | 1974 |
| 230 | Latin America | 2 | 8 | 1884 | 2158 |
| 239 | Meteorology | 2 | 7 | 3352 | 5588 |
| 239 | Agricultural Engineering | 2 | 7 | 747 | 1490 |
| 239 | Organizational learning | 1 | 7 | 1302 | 1596 |
| 239 | Biodiversity conservation | 3 | 7 | 2085 | 4136 |
| 239 | Knowledge management | 2 | 7 | 965 | 1778 |
| 239 | Water quality management | 2 | 7 | 2699 | 4608 |
| 239 | Water Microbiology | 2 | 7 | 698 | 1867 |
| 239 | Minority Health | 1 | 7 | 212 | 306 |
| 239 | commerce | 3 | 7 | 1937 | 3581 |
| 239 | coal | 1 | 7 | 2817 | 3920 |
| 249 | Systems Engineering | 2 | 6 | 3187 | 4738 |
| 249 | Petroleum Engineering | 1 | 6 | 1436 | 1960 |
| 249 | Climatology | 2 | 6 | 2505 | 4354 |
| 249 | Telecommunication Systems | 2 | 6 | 2227 | 3411 |
| 249 | Rural Development | 1 | 6 | 1252 | 1598 |
| 249 | Quality Assurance | 2 | 6 | 593 | 1528 |
| 249 | bioclimatology | 2 | 6 | 1377 | 2829 |
| 249 | Radiation | 1 | 6 | 4168 | 5190 |
| 249 | Aquatic ecosystems | 2 | 6 | 252 | 646 |
| 249 | Environmental forensics | 1 | 6 | 197 | 376 |
| 249 | infection | 1 | 6 | 3417 | 4791 |
| 249 | Japan | 1 | 6 | 4136 | 4854 |
| 249 | biological invasions | 1 | 6 | 1218 | 1844 |
| 249 | economic development projects | 1 | 6 | 489 | 859 |
| 249 | Immunity | 1 | 6 | 3561 | 4975 |
| 249 | Aquatic ecology | 2 | 6 | 1408 | 2566 |
| 265 | Environmental Law | 1 | 5 | 2305 | 3389 |
| 265 | Polymers | 1 | 5 | 7003 | 8525 |
| 265 | Property | 1 | 5 | 22 | 28 |
| 265 | marketing | 1 | 5 | 3256 | 4130 |
| 265 | Islam | 1 | 5 | 1243 | 1246 |
| 265 | United States | 2 | 5 | 8603 | 12646 |
| 265 | polymerization | 1 | 5 | 6001 | 7277 |
| 272 | Marine Biology | 1 | 4 | 4399 | 5861 |
| 272 | Regional Planning | 1 | 4 | 2943 | 3856 |
| 272 | Infection control | 1 | 4 | 1641 | 2619 |
| 272 | technology transfer | 2 | 4 | 399 | 1098 |
| 272 | Wireless Communication Systems | 2 | 4 | 2856 | 4354 |
| 272 | Urban Transportation | 1 | 4 | 423 | 812 |
| 272 | Virology | 1 | 4 | 5597 | 7605 |
| 272 | Bacteriology | 1 | 4 | 3568 | 5091 |
| 272 | Urban Renewal | 1 | 4 | 174 | 345 |
| 272 | Globalization | 2 | 4 | 818 | 2068 |
| 272 | freshwater biology | 1 | 4 | 1829 | 2638 |
| 283 | Pharmacology | 2 | 3 | 7667 | 11799 |
| 283 | Anthropology | 1 | 3 | 3292 | 3964 |
| 283 | Toxicology | 1 | 3 | 8273 | 10724 |
| 283 | Ethnobotany | 1 | 3 | 493 | 901 |
| 283 | Medical Anthropology | 1 | 3 | 2610 | 4258 |
| 283 | Aerosols | 2 | 3 | 851 | 1722 |
| 283 | Traditional medicine | 1 | 3 | 691 | 1269 |
| 283 | ethnobiology | 1 | 3 | 552 | 1032 |
| 283 | Roads | 1 | 3 | 1398 | 1974 |
| 283 | Phytotherapy | 1 | 3 | 1832 | 3070 |
| 283 | social marketing | 1 | 3 | 149 | 411 |
| 283 | Ethnomedicine | 1 | 3 | 391 | 832 |
| 295 | Biophysics | 1 | 2 | 9476 | 11935 |
| 295 | Nanotechnology | 1 | 2 | 7825 | 9999 |
| 295 | Agricultural Economics | 1 | 2 | 188 | 360 |
| 295 | Rural Sociology | 1 | 2 | 12 | 10 |
| 295 | Histochemistry | 1 | 2 | 2265 | 3364 |
| 295 | Soft Condensed Matter | 1 | 2 | 1914 | 2842 |
| 295 | Nanostructures | 1 | 2 | 4054 | 5597 |
| 295 | histological techniques | 1 | 2 | 1467 | 2393 |
| 295 | Conflict resolution | 1 | 2 | 3 | 9 |
| 295 | post-conflict reconstruction | 1 | 2 | 3 | 9 |
| 295 | conflict prevention | 1 | 2 | 3 | 9 |
| 295 | Asia | 1 | 2 | 5834 | 7805 |
| 295 | Methodology | 1 | 2 | 1089 | 1772 |
| 295 | Common Agricultural Policy | 1 | 2 | 12 | 10 |
| 295 | conflict management | 1 | 2 | 552 | 943 |
| 310 | Horticulture | 1 | 1 | 1576 | 2411 |
| 310 | Telecommunications | 1 | 1 | 1722 | 2627 |
| 310 | Nuclear Chemistry | 1 | 1 | 2139 | 3119 |
| 310 | Radiochemistry | 1 | 1 | 2052 | 2974 |
| 310 | Thermochemistry | 1 | 1 | 937 | 1522 |
| 310 | Marine invertebrates | 1 | 1 | 500 | 890 |
| 310 | Climate change | 1 | 1 | 1982 | 3189 |
| 310 | Electrochemistry | 1 | 1 | 5849 | 7326 |
| 310 | Eutrophication | 1 | 1 | 1819 | 2856 |
| 310 | Semiotics | 1 | 1 | 782 | 1016 |
| 310 | Communication | 1 | 1 | 3995 | 5787 |
| 310 | Library Science | 1 | 1 | 2728 | 3583 |
| 310 | technical education | 1 | 1 | 1036 | 1828 |
| 310 | scientific societies | 1 | 1 | 1810 | 3094 |
| 310 | educational planning | 1 | 1 | 857 | 1517 |
| 310 | Culture | 1 | 1 | 2149 | 3201 |
| 310 | Decision making | 1 | 1 | 3251 | 5262 |
| 327 | Nuclear Energy | 1 | 0 | 2225 | 3278 |
| 327 | Health Services Administration | 1 | 0 | 2625 | 4510 |
| 327 | Differential Equations | 1 | 0 | 1706 | 2424 |
| 327 | Thrombosis | 1 | 0 | 2206 | 3377 |
| 327 | Ichthyology | 1 | 0 | 1017 | 1716 |
| 327 | Porous materials | 1 | 0 | 1503 | 2475 |
| 327 | Therapeutics | 1 | 0 | 3660 | 5613 |
| 327 | drug therapy | 1 | 0 | 4629 | 6741 |
| 327 | Climate | 1 | 0 | 1310 | 2452 |
| 327 | weather | 1 | 0 | 1230 | 2366 |
| 327 | planning | 1 | 0 | 1612 | 2940 |
| 327 | Fish | 1 | 0 | 801 | 1393 |
