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Materia
- Environmental Science 34
- History 34
- Area Studies 15
- Earth and Environmental Science: General Interest 6
- Religion 6
- Hydrology 4
- Agriculture 3
- Climatology and Climate Change 3
- Ecology and Conservation 3
- Economics and Law 3
- Environmental Policy 3
- Natural Resource Management 3
- Natural Resource and Environmental Economics 3
- Engineering 2
- Environmental Law 2
- Geography 2
- Hydrogeology and Water Resources 2
- Philosophy 2
- Politics and International Relations 2
- Petroleum and Mining Geoscience 1