Columbia subject headings:
Germany--Boundaries--Poland.
Poland--Boundaries--Germany.
World War, 1914-1918--Territorial questions.
Harvard subject headings:
Germany--Boundaries--Poland.
Poland--Boundaries--Germany
World War, 1914-1918--Territorial questions
Princeton subject headings:
Germany--Boundaries--Poland.
Poland--Boundaries--Germany.
World War, 1914-1918--Territorial questions.