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Materia
- Philosophy 19
- Politics and International Relations 19
- History 4
- Area Studies 3
- British History after 1450 2
- Categories and Sets 2
- Ecology and Conservation 2
- Economics: General Interest 2
- Logic 2
- Agriculture 1
- Ancient Philosophy 1
- Artificial Intelligence and Natural Language Processing 1
- Biblical Studies - New Testament 1
- Botanical Reference 1
- English Language and Linguistics: General Interest 1
- English Literature 1830-1900 1
- English Literature 1900-1945 1
- English Literature: General Interest 1
- Environmental History 1
- Environmental Science 1