Klassifikationsnummer
- B - Philosophy, Psychology, Religion 54 results
- N - Fine Arts 34 results
- E - United States History 10 results
- Q - Science 9 results
- D - World History 7 results
- M - Music 6 results
- P - Language and Literature 6 results
- T - Technology 4 results
- H - Social Science 3 results
- R - Medicine 3 results
- C - Historical Sciences 2 results
- G - Geography, Anthropology, Recreation 2 results
- S - Agriculture 2 results