Columbia subject headings:
Bilingualism--Germany.
Languages in contact--Germany.
Russian language--Germany.
Harvard subject headings:
German language--Influence on Russian
Languages in contact--Germany.
Russian language--Germany.
Russian language--Influence on German
Russian language--Social aspects--Germany.
Sociolinguistics--Germany
Princeton subject headings:
Bilingualism--Germany.
Languages in contact--Germany.
Russian language--Germany.