Materia
- Theory 47
- science and mathematics 42
- International Relations Political Science 39
- psychology 39
- Metaphysics 37
- Moral Philosophy Philosophy 33
- African-American History 31
- Asian History 31
- Biology 30
- Epistemology Philosophy 29
- Physics 29
- History of Philosophy Philosophy 28
- History of Science, Technology, and Medicine 28
- Political Theory 28
- Political Theory Political Science 28
- American History: 20th Century 27
- Public International Law Law 27
- Religion and Society Religion 27
- neurology 25
- Comparative Politics Political Science 23