Columbia subject headings:
Harvard subject headings:
Germany--Boundaries--Poland.
Germany--Relations--Poland.
Oder-Neisse Line (Germany and Poland)--History.
Poland--Boundaries--Germany
Poland--Relations--Germany
Princeton subject headings:
Germany--Boundaries--Poland.
Germany--Relations--Poland.
Oder-Neisse Line (Germany and Poland)--History.
Poland--Boundaries--Germany.
Poland--Relations--Germany.