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Materia
- Agriculture 37
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- Area Studies 53
- Art 1
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- Botanical Reference 7
- Ecology and Conservation 14
- Economics 1
- Environmental Science 1
- Genetics 1
- Geography 5
- History 53
- History of Science 11
- History of Science: General Interest 1
- Horticulture and forestry 7
- Literature 3
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- Natural Resource Management 53
- Petrology and Volcanology 1
- Politics and International Relations 8