Columbia subject headings:
Harvard subject headings:
Europe--Economic integration--Congresses.
Germany--Boundaries--Poland--Congresses.
Germany--Foreign relations--1945---Congresses.
Germany--Foreign relations--Poland--Congresses.
Poland--Boundaries--Germany--Congresses.
Poland--Foreign relations--1945---Congresses.
Poland--Foreign relations--Germany--Congresses.
Princeton subject headings:
Europe--Economic integration--Congresses.
Germany--Boundaries--Poland--Congresses.
Germany--Foreign relations--1945---Congresses.
Germany--Foreign relations--Poland--Congresses.
Poland--Boundaries--Germany--Congresses.
Poland--Foreign relations--1945---Congresses.
Poland--Foreign relations--Germany--Congresses.