| Subclass P | Philology. Linguistics |
| Subclass PA | Greek language and literature. Latin language and literature |
| Subclass PB | Modern languages. Celtic languages |
| Subclass PC | Romance languages |
| Subclass PD | Germanic languages. Scandinavian languages |
| Subclass PE | English language |
| Subclass PF | West Germanic languages |
| Subclass PG | Slavic languages. Baltic languages. Albanian language |
| Subclass PH | Uralic languages. Basque language |
| Subclass PJ | Oriental languages and literatures |
| Subclass PK | Indo-Iranian languages and literatures |
| Subclass PL | Languages and literatures of Eastern Asia, Africa, Oceania |
| Subclass PM | Hyperborean, Indian, and artificial languages |
| Subclass PN | Literature (General) |
| Subclass PQ | French literature - Italian literature - Spanish literature - Portuguese literature |
| Subclass PR | English literature |
| Subclass PS | American literature |
| Subclass PT | Germanic literature - Dutch literature - Flemish literature since 1830 - Afrikaans literature - Scandinavian literature - Old Norse literature: Old Icelandic and Old Norwegian - Modern Icelandic literature - Faroese literature - Danish literature - Norwegian literature - Swedish literature |
| Subclass PZ | Fiction and juvenile belles lettres |
https://www.loc.gov/aba/cataloging/classification/lcco/lcco_p.pdf