Número de Clasificación
- T - Technology 1,221 results
- Q - Science 40 results
- H - Social Science 30 results
- G - Geography, Anthropology, Recreation 29 results
- L - Education 27 results
- N - Fine Arts 27 results
- F - General American History 15 results
- K - Law 15 results
- S - Agriculture 12 results
- V - Naval Science 12 results
- R - Medicine 6 results
- C - Historical Sciences 4 results
- U - Military Science 4 results
- D - World History 3 results
- M - Music 3 results
- Z - Library Science 3 results
- B - Philosophy, Psychology, Religion 2 results
- P - Language and Literature 1 results