Subfield
- Education15
- Linguistics and Language14
- Soil Science14
- Political Science and International Relations13
- Language and Linguistics11
- General Agricultural and Biological Sciences9
- Infectious Diseases9
- Human Factors and Ergonomics8
- Waste Management and Disposal8
- General Economics, Econometrics and Finance7
- Pediatrics, Perinatology and Child Health7
- Pollution7
- Safety Research7
- Applied Mathematics6
- Energy Engineering and Power Technology6
- General Health Professions6
- Management of Technology and Innovation6
- Public Health, Environmental and Occupational Health6
- Urban Studies6
- Finance5