Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations--1918-1945--Poland.
Europe--Foreign relations--Poland--1918-1945.
Poland--Foreign relations--1918-1945--Europe.
Poland--Foreign relations--Europe--1918-1945.
World War, 1939-1945--Campaigns--Poland.
World War, 1939-1945--Causes.
Princeton subject headings:
Europe--Foreign relations--1918-1945.
Poland--Foreign relations--1918-1945.
World War, 1939-1945--Diplomatic history.
World War, 1939-1945--Poland.