Número de Clasificación
- P - Language and Literature 82,670 results
- Q - Science 50,474 results
- H - Social Science 45,404 results
- D - World History 40,425 results
- B - Philosophy, Psychology, Religion 36,961 results
- T - Technology 30,851 results
- N - Fine Arts 18,950 results
- G - Geography, Anthropology, Recreation 14,138 results
- K - Law 13,519 results
- L - Education 13,233 results
- M - Music 12,927 results
- J - Political Science 12,603 results
- R - Medicine 10,072 results
- S - Agriculture 5,263 results
- E - United States History 5,112 results
- F - General American History 5,061 results
- Z - Library Science 2,888 results
- C - Historical Sciences 2,217 results
- U - Military Science 1,754 results
- A - General Works 694 results
- V - Naval Science 443 results