Columbia subject headings:
Poland--Foreign relations--1918-1945.
Poland--Military policy.
World War, 1939-1945--Campaigns--Poland.
Harvard subject headings:
Poland--Foreign relations--1918-1945
Poland--Military policy.
World War, 1939-1945--Campaigns--Poland.
Princeton subject headings:
Poland--Foreign relations--1918-1945.
Poland--Military policy.
World War, 1939-1945--Campaigns--Poland.