PA -- Greek language and literature; Latin language and literature
PB -- Modern languages; Celtic languages
PC -- Romanic languages
PD -- Germanic languages
PE -- English language
PF -- West Germanic languages
PG -- Slavic languages; Baltic languages; Albanian language
PH -- Uralic languages; Basque language
PJ -- Oriental philology and literature
PK -- Indo-Iranian philology and literature
PL -- Languages of Eastern Asia, Africa, Oceania
PM -- Hyperborean, Indian, and artificial languages
PN -- Literature (General)
PQ -- French literature -- Italian literature -- Spanish literature -- Portuguese literature
PR -- English literature
PS -- American literature
PT -- German literature -- Dutch literature -- Flemish literature since 1830 -- Scandinavian literature -- Old Norse literature: Old Icelandic and Old Norwegian -- Modern Icelandic literature -- Faroese literature -- Danish literature -- Norwegian literature -- Swedish literature