Número de Clasificación
- D - World History 68 results
- Q - Science 42 results
- L - Education 38 results
- K - Law 20 results
- T - Technology 19 results
- H - Social Science 17 results
- N - Fine Arts 14 results
- P - Language and Literature 12 results
- Z - Library Science 12 results
- J - Political Science 8 results
- S - Agriculture 8 results
- G - Geography, Anthropology, Recreation 5 results
- B - Philosophy, Psychology, Religion 4 results
- C - Historical Sciences 4 results
- E - United States History 2 results
- F - General American History 2 results
- R - Medicine 2 results
- U - Military Science 2 results
- V - Naval Science 2 results
- M - Music 1 results