Número de Clasificación
- H - Social Science 516 results
- G - Geography, Anthropology, Recreation 71 results
- D - World History 70 results
- N - Fine Arts 23 results
- T - Technology 21 results
- B - Philosophy, Psychology, Religion 16 results
- P - Language and Literature 16 results
- E - United States History 9 results
- J - Political Science 6 results
- F - General American History 5 results
- A - General Works 3 results
- S - Agriculture 3 results
- Z - Library Science 3 results
- C - Historical Sciences 2 results
- L - Education 1 results
- Q - Science 1 results