Materia
- Sociology 15
- Geography 14
- Earth and Environmental Sciences 12
- Philosophy Texts 12
- Ancient History 11
- Anthropology 10
- Archaeology 10
- Language and Linguistics 10
- Computer Science 9
- History of Ideas 9
- Theology 9
- General 8
- Classical Languages 7
- Music 7
- Philosophy: General Interest 7
- Political Philosophy 7
- Psychiatry 6
- Religion: General Interest 6
- Astronomy: General Interest 5
- Church History 5