A - GENERAL WORKS
| AC | Collections. Series. Collected Works |
| AE | Encyclopedias (General) |
| AG | Dictionaries and other general reference books |
| AI | Indexes (General) |
| AM | Museums(General). Collectors and collecting (General) |
| AN | Newspapers |
| AP | Periodicals (General) |
| AS | Academics and learned societies (General) |
| AY | Yearbooks. Almanacs. Directories |
| AZ | History of scholarship and learning. The humanities popular errors, delusions and superstitions. |
For a more detailed classification list see the Library of Congress Classification Outline at the Library of Congress web site: http://lcweb.loc.gov/catdir/cpso/lcco/lcco.html.