| Subclass C | Auxiliary Sciences of History (General) |
| Subclass CB | History of Civilization |
| Subclass CC | Archaeology |
| Subclass CD | Diplomatics. Archives. Seals |
| Subclass CE | Technical Chronology. Calendar |
| Subclass CJ | Numismatics |
| Subclass CN | Inscriptions. Epigraphy |
| Subclass CR | Heraldry |
| Subclass CS | Genealogy |
| Subclass CT | Biography |
https://www.loc.gov/aba/cataloging/classification/lcco/lcco_c.pdf