Klassifikationsnummer
- J - Political Science 445 results
- E - United States History 46 results
- D - World History 23 results
- H - Social Science 18 results
- T - Technology 14 results
- P - Language and Literature 13 results
- K - Law 9 results
- B - Philosophy, Psychology, Religion 5 results
- M - Music 4 results
- R - Medicine 4 results
- G - Geography, Anthropology, Recreation 3 results
- F - General American History 2 results
- L - Education 1 results
- N - Fine Arts 1 results
- S - Agriculture 1 results
- V - Naval Science 1 results