Columbia subject headings:
Harvard subject headings:
Russian Germans--Cultural assimilation--Germany--Mannheim--Case studies.
Russian Germans--Germany--Mannheim--Languages--Case studies.
Second language acquisition--Case studies.
Princeton subject headings:
Case studies.
Russian Germans--Cultural assimilation--Germany--Mannheim--Case studies.
Russian Germans--Germany--Mannheim--Languages--Case studies.
Second language acquisition--Case studies.