Klassifikationsnummer
- H - Social Science 140 results
- D - World History 37 results
- J - Political Science 7 results
- B - Philosophy, Psychology, Religion 5 results
- G - Geography, Anthropology, Recreation 5 results
- L - Education 4 results
- N - Fine Arts 3 results
- P - Language and Literature 3 results
- T - Technology 2 results
- K - Law 1 results
- Q - Science 1 results