Subfield
- Urban Studies17
- Waste Management and Disposal16
- Forestry14
- General Agricultural and Biological Sciences13
- Soil Science13
- Geography, Planning and Development12
- Pollution11
- Global and Planetary Change10
- Renewable Energy, Sustainability and the Environment9
- Parasitology8
- Aquatic Science7
- Insect Science7
- Nature and Landscape Conservation6
- Statistics and Probability6
- Applied Mathematics5
- Energy Engineering and Power Technology5
- Health Information Management5
- Infectious Diseases5
- Management, Monitoring, Policy and Law5
- Plant Science5