Columbia subject headings:
Language attrition--Soviet Union.
Peasants--Soviet Union--Language.
Russian language--Dialects--History--20th century.
Harvard subject headings:
Language attrition--Soviet Union.
Peasants--Soviet Union--Language.
Russian language--Dialects--History--20th century.
Princeton subject headings:
Language attrition--Soviet Union.
Peasants--Soviet Union--Language.
Russian language--Dialects--History--20th century.