Klassifikationsnummer
- T - Technology 61 results
- Q - Science 50 results
- H - Social Science 23 results
- L - Education 21 results
- E - United States History 20 results
- S - Agriculture 12 results
- N - Fine Arts 10 results
- M - Music 9 results
- B - Philosophy, Psychology, Religion 8 results
- F - General American History 8 results
- D - World History 7 results
- K - Law 7 results
- P - Language and Literature 3 results
- U - Military Science 3 results
- J - Political Science 2 results
- G - Geography, Anthropology, Recreation 1 results
- Z - Library Science 1 results