Subfield
- Waste Management and Disposal48
- Applied Mathematics46
- Accounting45
- Sociology and Political Science40
- Pollution39
- Communication38
- Strategy and Management38
- Health37
- General Economics, Econometrics and Finance35
- Management, Monitoring, Policy and Law34
- Plant Science34
- Social Psychology33
- Urban Studies33
- Water Science and Technology33
- Finance32
- Library and Information Sciences31
- Virology31
- Forestry30
- Geography, Planning and Development30
- Energy Engineering and Power Technology27