Columbia subject headings:
Germany--Foreign relations--Poland.
Poland--Foreign relations--Germany.
Poland--Foreign relations--Soviet Union.
Poland--History--1918-1945--Sources.
Soviet Union--Foreign relations--Poland.
Harvard subject headings:
Germany--Foreign relations--Poland.
Poland--Foreign relations--Germany
Poland--Foreign relations--Soviet Union
Poland--History--1918-1945--Sources.
Soviet Union--Foreign relations--Poland.
Princeton subject headings:
Germany--Foreign relations--Poland.
Poland--Foreign relations--Germany.
Poland--Foreign relations--Soviet Union.
Poland--History--1918-1945--Sources.
Soviet Union--Foreign relations--Poland.