Columbia subject headings:
Germany--Armed Forces--History--20th century.
Germany--Military relations--Poland.
Poland--Military relations--Germany.
Harvard subject headings:
Germany--Armed Forces--History--20th century.
Germany--Military relations--Poland.
Poland--Military relations--Germany.
Princeton subject headings:
Germany--Armed Forces--History--20th century.
Germany--Military relations--Poland.
Poland--Military relations--Germany.