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Materia
- Environmental Science 141
- History 34
- Area Studies 31
- Earth and Environmental Science: General Interest 26
- Literature 23
- Ecology and Conservation 21
- Politics and International Relations 21
- Hydrology 17
- Climatology and Climate Change 14
- Agriculture 13
- Natural Resource Management 13
- Philosophy 13
- Law 12
- Natural Resource and Environmental Economics 12
- Religion 11
- Economics 9
- Economics and Law 8
- Environmental Policy 8
- Language and Linguistics 8
- Physics And Astronomy 8