Klassifikationsnummer
- J - Political Science 66 results
- D - World History 48 results
- E - United States History 26 results
- F - General American History 20 results
- H - Social Science 14 results
- B - Philosophy, Psychology, Religion 12 results
- P - Language and Literature 10 results
- K - Law 8 results
- U - Military Science 8 results
- C - Historical Sciences 2 results
- G - Geography, Anthropology, Recreation 2 results
- L - Education 2 results
- S - Agriculture 2 results