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Materia
- Area Studies 35
- Plant Sciences 35
- History 17
- Ecology and Conservation 12
- Politics and International Relations 9
- Literature 7
- Botanical Reference 4
- Evolutionary Biology 4
- Law 4
- Cell Biology and Developmental Biology 3
- Earth and Environmental Science: General Interest 3
- Palaeontology and Life History 3
- Zoology 3
- Geography 2
- Language and Linguistics 2
- Microbiology and Immunology 2
- Religion 2
- Sociology 2
- Anthropology 1
- Archaeology 1