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Materia
- Agriculture 30
- Natural Resource Management 15
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- Area Studies 5
- Botanical Reference 4
- Ecology and Conservation 4
- History 4
- History of Science 4
- Plant Sciences 3
- Politics and International Relations 3
- Law 2
- Classical Studies 1
- Culture & Society 1
- General 1
- Life Sciences 1
- Literature 1
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- Medicine 1
- Philosophy 1
- Philosophy of Science 1