Klassifikationsnummer
- P - Language and Literature 253 results
- D - World History 14 results
- H - Social Science 10 results
- L - Education 10 results
- G - Geography, Anthropology, Recreation 7 results
- B - Philosophy, Psychology, Religion 5 results
- N - Fine Arts 2 results
- F - General American History 1 results
- K - Law 1 results
- R - Medicine 1 results
- S - Agriculture 1 results
- T - Technology 1 results