Class P: Language and Literature is a first order classification in the Library of Congress Classification system. It contains 19 sub-classifications, 12 of which are dedicated to language families and geographic groups of languages, and 10 sub-classifications of literature (4 subclasses contain both languages and literatures).
P1-1091 Philology. Linguistics
P1-85 General
P87-96 Communication. Mass media
P98-98.5 Computational linguistics. Natural language processing
P99-99.4 Semiotics. Signs and symbols
P99.5-99.6 Nonverbal communication
P101-410 Language. Linguistic theory. Comparative grammar
P501-769 Indo-European (Indo-Germanic) philology
P901-1091 Extinct ancient or medieval languages
Subclass PA - Greek and Latin languages and literature
PA1-199 Classical philology
PA201-899 Greek philology and language
PA1000-1179 Medieval and modern Greek language
PA2001-2915 Latin philology and language
PA3000-3049 Classical literature
PA3050-4505 Greek literature
PA3051-3285 Literary history
PA3300-3516 Collections
PA3520-3564 Criticism, interpretation, etc.
PA3601-3681 Translations
PA3818-4505 Individual authors
PA5000-5660 Byzantine and modern Greek literature
PA6000-6971 Roman literature
PA8001-8595 Medieval and modern Latin literature
PB1-3029 Modern languages. Celtic languages
PB1-431 Modern languages
PB1001-3029 Celtic languages and literature
PC1-5498 Romance
PC1-400 General
PC601-872 Romanian
PC901-986 Raeto-Romance, including Romansh
PC1001-1977 Italian
PC1981-1984 Sardinian
PC2001-3761 French
PC3801-3976 Catalan
PC4001-4977 Spanish
PC5001-5498 Portuguese
Subclass PD - Germanic languages. Scandinavian languages
PD1-(7159) Germanic
PD1-780 General
PD1001-1350 Old Germanic dialects
PD1501-(7159) North Germanic. Scandinavian
PE1-3729 English
PE101-(458) Anglo-Saxon. Old English
PE501-(693) Middle English
PE(814)-896 Early Modern English
PE1001-1693 Modern English
PE1700-3602 Dialects. Provincialisms, etc.
PE3701-3729 Slang. Argot, etc.
PF1-5999 West Germanic
PF1-979 Dutch
PF1001-1184 Flemish
PF1401-1541 Friesian
PF3001-5999 German
Subclass PG - Slavic, Baltic, and Albanian languages
PG1-9665 Slavic. Baltic. Albanian
PG1-7925 Slavic
PG8001-9146 Baltic
PG9501-9665 Albanian
Subclass PH - Uralic languages and Basque
PH1-5490 Uralic. Basque
PH1-87 General
PH91-98.5 Finnic. Baltic-Finnic
PH101-405 Finnish
PH501-1109 Other Finnic languages and dialects
PH1201-1409 Ugric languages
PH2001-3445 Hungarian
PH3801-3820 Samoyedic languages
PH5001-5490 Basque
Subclass PJ - Oriental languages and literatures
PJ1-(9500) Oriental philology and literature
PJ1-489 General
PJ601-989 Special groups
PJ991-995 Afroasiatic languages
PJ1001-1989 Egyptology
PJ2001-2199 Coptic
PJ2340-2399 Libyco-Berber languages. Berber languages
PJ2401-2594 Cushitic languages
PJ3001-3097 Semitic philology and literature
PJ3101-(3971) Assyriology. Akkadian
PJ4001-(4091) Sumerian
PJ4101-4197 West and North Semitic languages
PJ4501-5192 Hebrew
PJ5201-5329.5 Aramaic
PJ5401-5809 Syriac
PJ5701-5709 East Syriac (Nestorian)
PJ5711-5719 West Syriac (Jacobite)
PJ5801-5809 Neo-Syriac dialects (Modern Syriac)
PJ5901-5909 South Semitic languages
PJ6001-8517 Arabic
PJ8991-9348 Ethiopian languages
Subclass PK - Indo-Iranian languages and literatures
PK1-(9601) Indo-Iranian philology and literature
PK1-85 General
PK101-2899 Indo-Aryan languages
PK(2901)-5471 Indo-Aryan literature
PK6001-6996 Iranian philology and literature
PK7001-7075 Dardic (Pisacha)
PK8001-8832 Armenian
PK9001-9201 Caucasian languages
Subclass PL - Languages and literatures of Eastern Asia, Africa, Oceania
PL1-8844 Languages of Eastern Asia, Africa, Oceania
PL1-481 Ural-Altaic languages
PL(490)-495 Far Eastern languages and literature
PL501-889 Japanese language and literature
PL901-998 Korean language and literature
PL1001-3208 Chinese language and literature
PL3301-3311 Non-Chinese languages of China
PL3501-3509 Non-Aryan languages of India and Southeastern Asia in general
PL3512 Malaysian literature
PL3515 Singapore literature
PL3518 Languages of the Montagnards
PL3521-4001 Sino-Tibetan languages
PL4051-4054 Karen languages
PL4070-4074 Miao-Yao languages
PL4281-4587 Austroasiatic languages
PL4601-(4890) Dravidian languages
PL5001-7511 Languages of Oceania
PL8000-8844 African languages and literature
Subclass PM - Hyperborean, Indian, and artificial languages
PM1-9021 Hyperborean, Indian, and artificial languages
PM1-94 Hyperborean languages of Arctic Asia and America
PM101-2711 American languages (Aboriginal)
PM3001-4566 Languages of Mexico and Central America
PM5001-7356 Languages of South America and the West Indies
PM7801-7895 Mixed languages
PM8001-8995 Artificial languages--Universal languages
PM8999 Picture languages
PM9001-9021 Secret languages
PN1-6790 Literature (General)
PN1-9 Periodicals
PN20-30 Societies
PN45-57 Theory. Philosophy. Esthetics
PN59-72 Study and teaching
PN80-99 Criticism
PN101-245 Authorship
PN441-1009.5 Literary history
PN1010-1525 Poetry
PN1530 The monologue
PN1551 The dialogue
PN1560-1590 The performing arts. Show business
PN1600-3307 Drama
PN3311-3503 Prose. Prose fiction
PN4001-4355 Oratory. Elocution, etc.
PN4390 Diaries
PN4400 Letters (Literary history)
PN4500 Essays (Literary history)
PN4699-5650 Journalism. The periodical press, etc.
PN6010-6790 Collections of general literature
Subclass PQ - French, Italian, Spanish, and Portuguese literature
PQ1-3999 French literature
PQ1-771 History and criticism
PQ(781)-841) Folk literature
PQ845 Juvenile literature
PQ1100-1297 Collections
PQ1300-1595 Old French literature to ca. 1500/1550
PQ1600-2726 Modern literature
PQ3800-3999 Provincial, local, colonial, etc.
PQ4001-5999 Italian literature
PQ4001-4199.5 History and criticism
PQ4201-4263 Collections
PQ4265-4926 Individual authors and works
PQ5901-5999 Regional, provincial, local, etc.
PQ6001-8929 Spanish literature
PQ6001-6168 History and criticism
PQ6170-6269 Collections
PQ6271-6726 Individual authors and works
PQ7000-8929 Provincial, local, colonial, etc.
PQ9000-9999 Portuguese literature
PQ9000-9129 History and criticism
PQ9131-9188 Collections
PQ9189-9326 Individual authors and works
PQ9400-9999 Provincial, local, colonial, etc.
PR1-9680 English literature
PR1-56 Literary history and criticism
PR57-78 Criticism
PR111-116 Women authors
PR125-(138.5) Relations to other literatures and countries
PR161-488 By period
PR500-614 Poetry
PR621-744 Drama
PR750-890 Prose
PR901-907.2 Oratory
PR908 Diaries
PR911-918 Letters
PR921-928 Essays
PR931-938 Wit and humor
PR(951)-981 Folk literature
PR1098-1369 Collections of English literature
PR1490-1799 Anglo-Saxon literature
PR1803-2165 Anglo-Norman period. Early English. Middle English
PR2199-3195 English renaissance (1500-1640)
PR3291-3785 17th and 18th centuries (1640-1770)
PR3991-5990 19th century, 1770/1800-1890/1900
PR6000-6049 1900-1960
PR6050-6076 1961-2000
PR6100-6126 2001
PR8309-9680 English literature: Provincial, local, etc.
PS1-3576 American literature
PS126-138 Biography, memoirs, letters, etc.
PS147-152 Women authors
PS163-173 Treatment of special subjects, classes
PS185-231 By period
PS241-286 Special regions, states, etc.
PS301-326 Poetry
PS330-353 Drama
PS360-380 Prose
PS400-408.2 Oratory
PS409 Diaries
PS410-419 Letters
PS420-429 Essays
PS430-439 Wit and humor. Satire
PS(451)-478 Folk literature
PS490 Juvenile literature (General)
PS501-689 Collections of American literature
PS700-3622 Individual authors
PS(8001-8599) Canadian literature
PT1-4897 German literature
PT1-80 Literary history and criticism
PT83-(873) History of German literature
PT(881)-(951) Folk literature
PT1100-1479 Collections
PT1501-2728 Individual authors or works
PT3701-3971 Provincial, local, colonial, etc.
PT4801-4897 Low German literature
PT5001-5980 Dutch literature
PT5001-5348 Literary history and criticism
PT(5351)-5395 Folk literature
PT5398 Juvenile literature (General)
PT5400-5547 Collections
PT5555-5882.36 Individual authors or works
PT5901-5980 Provincial, local, foreign
PT6000-6467.36 Flemish literature since 1830
PT6500-6593.36 Afrikaans literature
PT6500-6530 Literary history and criticism
PT(6540)-6545 Folk literature
PT6550-6575 Collections
PT6580 Local
PT6590-6593.36 Individual authors or works
PT7001-7099 Scandinavian literature
PT7001-7099 General
PT7101-7338 Old Norse literature: Old Icelandic and Old Norwegian
PT7351-7550 Modern Icelandic literature
PT7581-7599 Faroese literature
PT7581-7592 Literary history and criticism
PT7593-7596.5 Collections
PT7597 Local
PT7598-7599 Individual authors or works
PT7601-8260 Danish literature
PT7601-7869 Literary history and criticism
PT(7900)-7930 Folk literature
PT7935 Juvenile literature (General)
PT7945-8046 Collections
PT8050-8177.36 Individual authors or works
PT8205-8260 Provincial, local, foreign
PT8301-9155 Norwegian literature
PT8301-8574 Literary history and criticism
PT(8600)-(8637) Folk literature
PT8640 Juvenile literature (General)
PT8650-8733 Collections
PT8750-8952.36 Individual authors or works
PT9000-9094 Landsmaal or New Norwegian
PT9100-9155 Provincial, local, foreign
PT9201-9999 Swedish literature
PT9201-9499 Literary history and criticism
PT(9509)-(9542) Folk literature
PT9544 Juvenile literature (General)
PT9547-9639 Collections
PT9565-9570 Translations
PT9580-9599 Poetry
PT9605-9625 Drama
PT9626-9639 Prose
PT9650-9877.36 Individual authors or works
PT9950-9999 Provincial, local, foreign
Subclass PZ - Fiction and juvenile belles lettres
PZ(1)-90 Fiction and juvenile belles lettres
Library of Congress Classification:Class P -- Language and Literature Wikipedia (Text) CC BY-SA