Columbia subject headings:
Bilingualism--Soviet Union.
Language planning--Soviet Union.
Languages in contact--Soviet Union.
Russian language--Social aspects--Soviet Union.
Soviet Union--Languages--Political aspects.
Harvard subject headings:
Bilingualism--Soviet Union.
Language planning--Soviet Union.
Languages in contact--Soviet Union.
Russian language--Social aspects--Soviet Union.
Soviet Union--Languages--Political aspects.
Princeton subject headings: