Número de Clasificación
- H - Social Science 1,275 results
- Q - Science 772 results
- L - Education 722 results
- G - Geography, Anthropology, Recreation 341 results
- R - Medicine 332 results
- B - Philosophy, Psychology, Religion 293 results
- P - Language and Literature 217 results
- S - Agriculture 199 results
- T - Technology 178 results
- J - Political Science 157 results
- D - World History 64 results
- K - Law 44 results
- F - General American History 38 results
- Z - Library Science 33 results
- A - General Works 23 results
- N - Fine Arts 23 results
- C - Historical Sciences 9 results
- M - Music 9 results
- U - Military Science 9 results
- E - United States History 6 results
- V - Naval Science 5 results