Klassifikationsnummer
- H - Social Science 278 results
- F - General American History 248 results
- P - Language and Literature 140 results
- Q - Science 86 results
- E - United States History 69 results
- L - Education 64 results
- T - Technology 44 results
- R - Medicine 35 results
- J - Political Science 34 results
- K - Law 34 results
- N - Fine Arts 34 results
- B - Philosophy, Psychology, Religion 26 results
- S - Agriculture 26 results
- G - Geography, Anthropology, Recreation 25 results
- M - Music 18 results
- C - Historical Sciences 5 results
- D - World History 4 results
- Z - Library Science 4 results
- U - Military Science 2 results