Columbia subject headings:
Europe--History--1918-1945.
Poland--Foreign relations--1918-1945.
Poland--History--1918-1945.
World War, 1939-1945--Poland.
Harvard subject headings:
Europe--History--1918-1945.
Poland--Foreign relations--1918-1945
Poland--History--1918-1945
World War, 1939-1945--Poland.
Princeton subject headings:
Europe--History--1918-1945.
Poland--History--1918-1945.
World War, 1939-1945--Poland.