Columbia subject headings:
Germany--Foreign relations--Poland--Congresses.
Minorities--Legal status, laws, etc.--Europe--Congresses.
Minorities--Legal status, laws, etc.--Poland--Congresses.
Poland--Foreign relations--Germany--Congresses.
Harvard subject headings:
Human rights--Poland--Congresses.
Humanr rights--Germany--Congrsses.
Minorities--Legal status, laws, etc.--Germany--Congresses.
Minorities--Legal status, laws, etc.--Poland--Congresses.
Princeton subject headings: