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Materia
- Area Studies 31
- Environmental Science 31
- History 15
- Literature 9
- Earth and Environmental Science: General Interest 5
- Climatology and Climate Change 4
- Politics and International Relations 4
- Ecology and Conservation 3
- Natural Resource and Environmental Economics 3
- Agriculture 2
- Archaeology 2
- Economics and Law 2
- Environmental Policy 2
- Law 2
- Mineralogy 2
- Natural Resource Management 2
- Petrology and Volcanology 2
- Religion 2
- British History: General Interest 1
- Civil and Geotechnical Engineering 1