Columbia subject headings:
Harvard subject headings:
Anthropology--Balkan Peninsula--Congresses.
Balkan Peninsula--Ethnic relations--Congresses.
Ethnic groups--Balkan Peninsula--Congresses.
Ethnology--Balkan Peninsula--Congresses.
Folklore--Balkan Peninsula--Congresses.
Frontier and pioneer life--Balkan Peninsula--Congresses.
Princeton subject headings:
Anthropology--Balkan Peninsula--Congresses.
Culture--Balkan Peninsula--Congresses.
Ethnology--Balkan Peninsula--Congresses.
Folklore--Balkan Peninsula--Congresses.