Columbia subject headings:
Allegiance--Europe, Central--Congresses.
Allegiance--Europe, Eastern--Congresses.
Europe, Central--Ethnic relations--Congresses.
Europe, Eastern--Ethnic relations--Congresses.
Minorities--Europe, Central--Congresses.
Minorities--Europe, Eastern--Congresses.
Harvard subject headings:
Allegiance--Europe, Central--Congresses.
Allegiance--Europe, Eastern--Congresses.
Europe--History--1918-1945--Congresses.
Germans--Europe--History--Congresses.
Minorities--Balkan Peninsula--Congresses.
Minorities--Europe, Central--Congresses.
Minorities--Europe, Eastern--Congresses.
Minorities--Europe--Political activity--Congresses.
Princeton subject headings:
Allegiance--Europe, Central--Congresses.
Allegiance--Europe, Eastern--Congresses.
Europe, Central--Ethnic relations--Congresses.
Europe, Eastern--Ethnic relations--Congresses.
Minorities--Europe, Central--Congresses.
Minorities--Europe, Eastern--Congresses.