Klassifikationsnummer
- Q - Science 364 results
- T - Technology 219 results
- G - Geography, Anthropology, Recreation 39 results
- P - Language and Literature 25 results
- E - United States History 4 results
- H - Social Science 4 results
- V - Naval Science 4 results
- C - Historical Sciences 3 results
- K - Law 3 results
- R - Medicine 2 results
- D - World History 1 results
- M - Music 1 results
- S - Agriculture 1 results