Subclass P: Philology and linguistics
Subclass PA: Greek language and literature
Subclass PAA: Latin language and literature
Latin language and literature covers all works in or about the Latin language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and many schools and universities continue to teach it.
Subclass PB: Modern languages
Modern languages are languages that are currently in use for day-to-day communication, as opposed to "dead" languages such as Latin, Sanskrit and Classical Chinese.
Subclass PBA: Celtic languages
Celtic languages covers all works in or about Celtic languages, such as Gaelic, Welsh and Gaulish. Celtic languages are most commonly spoken on the north-western edge of Europe.
Subclass PC: Romanic languages
Romanic languages covers all works about the Romanic languages (also known as the Romance, Latin, Neolatin or Neo-Latin languages), such as Italian, French and Spanish.
Subclass PD: Germanic languages
Germanic languages covers all works about the Germanic languages, such as German, Gothic, Vandalic and Burgundian.
Scandinavian languages covers all works about Scandinavian languages, also known as North Germanic languages, such as Danish, Swedish, Norwegian and Old Norse.
Subclass PE: English languages
English language covers all about the English language. Originating in the Anglo-Saxon kingdoms of England, it has become the world's major trade language and the third most natively spoken language in the world, after Mandarin Chinese and Spanish.
Subclass PF: West Germanic languages
West Germanic languages covers all works about West Germanic languages, such as Dutch, Flemish, Friesian and Yiddish.
Subclass PG: Slavic languages and literatures
Subclass PGA: Baltic languages
Baltic languages are mainly spoken in the areas extending east and south-east of the Baltic Sea in Northern Europe; such as Latvian, Lithuanian and Old Prussian.
Subclass PGB: Albanian languages
The Albanian language is an Indo-European language in a branch by itself (a "language isolate") spoken primarily in Albania, Kosovo and some other parts of the Balkans.
Subclass PH: Uralic languages and literature
Subclass PHA: Basque language
Subclass PJ: Oriental languages and literature
Subclass PK: Indo-Iranian languages and literature
Subclass PL: Languages and literatures of Eastern Asia
Subclass PLA: Languages and literatures of Africa
Subclass PLB: Languages and literatures of Oceania
Subclass PM: Hyperborean languages
Hyperborean languages covers all works in or about the languages of the Arctic Circle, such as Inuit, Yupik and Aleut languages.
Subclass PMA: Indian languages
Indian languages covers all works in or about the indigenous languages of the Americas; such as Iroquoian, Navajo and Quechua.
Subclass PMB: Artificial languages
Artificial languages covers languages that have been consciously devised by an individual or group, instead of having evolved naturally, such as Esperanto and Volapük.
Subclass PN: General literature
Subclass PQ: Romanic literature
Subclass PR: English literature
Subclass PS: American literature
Subclass PT: Germanic literature
Subclass PZ: Fiction and juvenile belles lettres