Columbia subject headings:
Harvard subject headings:
Germany--Foreign relations--Poland.
Germany--Foreign relations--Russia.
Poland--Foreign relations--Germany
Poland--Foreign relations--Russia.
Russia--Foreign relations--Germany.
Russia--Foreign relations--Poland.
Princeton subject headings:
Germany--Foreign relations--Poland--Congresses.
Germany--Foreign relations--Russia--Congresses.
Germany--Foreign relations--Soviet Union--Congresses.
Poland--Foreign relations--Germany--Congresses.
Poland--Foreign relations--Russia--Congresses.
Poland--Foreign relations--Soviet Union--Congresses.
Russia--Foreign relations--Germany--Congresses.
Russia--Foreign relations--Poland--Congresses.
Soviet Union--Foreign relations--Germany--Congresses.
Soviet Union--Foreign relations--Poland--Congresses.