Columbia subject headings:
Harvard subject headings:
Germans--Soviet Union--History
Germany--History--20th century.
Quakers--Persecutions--History--20th century.
Russians--Germany--History--20th century.
Soviet Union--History.
Princeton subject headings:
Germany--Foreign relations--Russia (Federation).
Germany--Foreign relations--Russia.
Germany--Foreign relations--Soviet Union.
Russia (Federation)--Foreign relations--Germany.
Russia--Foreign relations--Germany.
Soviet Union--Foreign relations--Germany.