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Materia
- Mineralogy 90
- Petrology and Volcanology 69
- Earth and Environmental Science: General Interest 41
- History 16
- Area Studies 15
- Geochemistry and Environmental Chemistry 11
- History of Science: General Interest 10
- Politics and International Relations 10
- Economics 8
- Literature 8
- Medicine 8
- Structural Geology 8
- Language and Linguistics 7
- Law 7
- Philosophy 7
- Physics And Astronomy 7
- Geomorphology and Physical Geography 6
- Life Sciences 6
- Mathematics 5
- Sociology 5