Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Ethnic relations--Congresses.
Europe, Central--Ethnic relations--Congresses.
Language and culture--Balkan Peninsula--Congresses.
Language and culture--Europe, Central--Congresses.
Minorities--Balkan Peninsula--Congresses.
Minorities--Europe, Central--Congresses.
Minorities--Legal status, laws, etc.--Balkan Peninsula--Congresses.
Minorities--Legal status, laws, etc.--Europe, Central--Congresses.
Princeton subject headings:
Balkan Peninsula--Ethnic relations--Congresses.
Europe, Central--Ethnic relations--Congresses.
Language and culture--Balkan Peninsula--Congresses.
Language and culture--Europe, Central--Congresses.
Linguistic minorities--Balkan Peninsula--Congresses.
Linguistic minorities--Europe, Central--Congresses.
Minorities--Legal status, laws, etc.--Balkan Peninsula--Congresses.
Minorities--Legal status, laws, etc.--Europe, Central--Congresses.