| A: General Works (Encyclopedias, etc) | N: Fine Arts |
| B: Philosophy, Psychology, Religion | P: Language and Literature |
| C: Auxiliary Sciences of History | Q: Science |
| (Includes Genealogy, Biography) | R: Medicine |
| D: History: General and Old World | S: Agriculture |
| E and F: History: America | T: Technology |
| G: Geography, Anthropology, Recreation | (Includes Home Economics) |
| H: Social Sciences | U: Military Science |
| J: Political Science | V: Naval Science |
| K: Law | Z: Bibliography, Library Science |
| L: Education | |
| M: Music |