Klassifikationsnummer
- D - World History 42 results
- H - Social Science 10 results
- G - Geography, Anthropology, Recreation 4 results
- L - Education 4 results
- R - Medicine 4 results
- T - Technology 3 results
- C - Historical Sciences 2 results
- P - Language and Literature 2 results
- E - United States History 1 results
- K - Law 1 results
- M - Music 1 results
- S - Agriculture 1 results
- Z - Library Science 1 results