Columbia subject headings:
Chuvashia (Russia)--Ethnic relations--Congresses.
Ural Mountains Region (Russia)--Ethnic relations--Congresses.
Volga River Region (Russia)--Ethnic relations--Congresses.
Harvard subject headings:
Ural Mountains Region (Russia)--Ethnic relations--Congresses.
Volga River Region (Russia)--Ethnic relations--Congresses.
Princeton subject headings: