Columbia subject headings:
Harvard subject headings:
Germans--Soviet Union--Biography--History--Sources--Congresses.
Immigrants' writings, German--Soviet Union--History--Sources--Congresses.
Immigrants--Germany--Cultural assimilation--Soviet Union--History--Sources--Congresses.
Political persecution--Soviet Union--History--Sources--Congresses.
Political refugees--Germany--Biography--History and criticism--Congresses.
Political refugees--Soviet Union--Biography--History and criticism--Congresses.
Princeton subject headings:
Germans--Soviet Union--Biography--History--Sources--Congresses.
Immigrants' writings, German--Soviet Union--History--Sources--Congresses.
Immigrants--Cultural assimilation--Soviet Union--History--Sources--Congresses.
Political persecution--Soviet Union--History--Sources--Congresses.
Political refugees--Germany--Biography--History and criticism--Congresses.
Political refugees--Soviet Union--Biography--History and criticism--Congresses.