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81Linguistics and languages
81;1 
81;39Ethnolinguistics
81-112Diachronic linguistics (historical linguistics)
81-115 
81-13Methodology of linguistics. Methods and means
81-23 
81-24 
81-25Colloquial language
81’0Special auxiliary numbers for origins and periods
of languages
81’01Old period. Archaic period
81’02Classical period
81’04Middle period
81’06Modern period
81’1General linguistics
81`1(072)Linguistics.Documentary materials for teaching.
Teaching aids
81`1(075)Linguistics.Educational texts. Schoolbooks.
Texts for students
81`1(075)Linguistics.Textbooks
81`1(075.2)Linguistics.Schoolbooks
81’1(075.8)Linguistics.Texts for students
81’1(09)Linguistics.Historiography
81’1:061.4(100)
→81’1(063)
Linguistics.Congresses
81’22General theory of signs in relation to linguistics.
Semiology. Semiotics
81’221.2Sign language
81’23Psycholinguistics. Psychology of language
81’24Practical knowledge of languages
81’242Native language
81’243Foreign language.
81’246Monolingualism. Bilingualism
81’246.1Monolingualism
81’246.2Bilingualism
81’246.3Multilingualism
81’25Theory of translation
81’253Simultaneous interpreting
81’255 
81’255.2Literary translation
81’255.4Stylistics of translation
81`27Sociolinguistics. Usage of language
81’271.2Linguistic culture
81’272Language policy
81’276Sociolect.Slang.Jargon
81’28Dialectology. Geographical linguistics. Areal linguistics
81’33Applied linguistics
81’34Phonetics. Phonology
81’342Phonetics
81’35Graphemics. Orthography. Spelling
81’351Alphabets
81’36Grammar
81’362Grammar, Comparative
81’366Morphology.
81’367Syntax
81’367.3Sentnces
81’367.6Parts of speech
81’37Semantics
81’373Lexicology
81’373.2Onomastics
81’373.21Names, Geographical.
81’373.231Names, Personal
81’373.4Word (Linguistics)
81’373.42Synonyms.Antonyms.Homonyms.Homograph
81’373.6Etymology.
81’374Lexicography .Dictionaries.
81’374.2Typs of dictionaries
81’374.221Dictionaries of synonyms (thesauri)
81’374.3Explanatory dictionary
81’374.4Etymological dictionary
81’374.5Phonetic dictionary
81’374.8 
81’374.81 
81’374.82 
81’374.822Bilingual dictionaries
81’374.823Multilingual dictionary
81’38General stylistics
811Languages
811.1/.8Individual natural languages
811.1/.2Indo-European languages
811.11Germanic languages
811.111English language
811.111(072) 
811.111(075) 
811.111(075)->(076.5) 
811.111(075.2) 
811.111(075.8) 
811.111(082) 
811.111(09) 
811.111=025 
811.111’01 
811.111’04 
811.111’28 
811.111’342 
811.111’35 
811.111’36 
811.111’362 
811.111’366 
811.111’367 
811.111’367.3 
811.111’367.6 
811.111’37 
811.111’373 
811.111’373.2 
811.111’373.21 
811.111’373.231 
811.111’373.42 
811.111’373.6 
811.111’374 
811.111’374.8 
811.111’374.8=161.1 
811.111’374= 
811.112.2 
811.112.28 
811.112.5 
811.112.6 
811.113.3 
811.113.4 
811.113.5 
811.113.6 
811.124 
811.124’01 
811.124’02 
811.124’04 
811.124’06 
811.13 
811.131.1 
811.133.1 
811.134.2 
811.134.3 
811.135.1 
811.135.2 
811.14 
811.14’02Classical Greek
811.14’03Koine (New Testament Greek)
811.14’04Byzantine Greek
811.14’06Modern Greek
811.152.1 
811.152.2 
811.16 
811.161East Slavic languages
811.161.1 
811.161.2 
811.161.3 
811.162West Slavic languages
811.162.1 
811.162.2 
811.162.3 
811.162.4 
811.163South Slavic languages
811.163.1 
811.163.2 
811.163.3 
811.163.4Serbian and Croatian languages
811.163.41 
811.163.42 
811.163.6 
811.17Baltic languages
811.172 
811.174 
811.18 
811.19 
811.21/22 
811.21Indic languages
811.211 
811.211’01 
811.212 
811.213 
811.214 
811.214.21 
811.214.22 
811.214.27 
811.214.32 
811.214.58 
811.22 
811.221.18 
811.221.31 
811.222.1 
811.222.1’01 
811.222.1’02 
811.222.1’04Middle Persian language
811.222.1’06Modern Persian language
811.222.5 
811.222.8 
811.293 
811.341.1 
811.341.4 
811.341.6 
811.35 
811.351Northeast Caucasian languages
811.351.12 
811.351.21 
811.351.22 
811.351.32 
811.351.41 
811.351.42 
811.351.43 
811.352Northwest Caucasian languages
811.352.1 
811.352.2 
811.352.3 
811.353Southern (Kartvelian) group
811.353.1 
811.353.2 
811.353.31 
811.41 
811.411 
811.411.1 
811.411.11 
811.411.111 
811.411.112Suret language
811.411.152 
811.411.16 
811.411.17 
811.411.172.3 
811.411.172.3’06 
811.411.21 
811.411.41 
811.412 
811.412’09 
811.51Ural-Altaic languages
811.511.111 
811.511.113 
811.511.131 
811.511.132 
811.511.14 
811.511.141 
811.511.14 
811.512 
811.512.1 
811.512.111 
811.512.121 
811.512.122 
811.512.123 
811.512.133 
811.512.141 
811.512.142 
811.512.145 
811.512.154 
811.512.157 
811.512.161 
811.512.162 
811.512.164 
811.512.31 
811.512.37 
811.521 
811.531 
811.581 
811.584.6 
811.6Austro-Asiatic languages. Austronesian languages
811.612.4 
811.612.91 
811.9Artificial languages
811.921 
811.922 
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