Columbia subject headings:
Harvard subject headings:
Regional planning--Russia (Federation)--Volga River Region--Congresses.
Regionalism--Russia (Federation)--Volga River Region--Congresses.
Volga River Region (Russia)--Economic conditions--20th century--Congresses.
Volga River Region (Russia)--Politics and government--Congresses.
Volga River Region (Russia)--Social conditions--20th century--Congresses.
Volga River Region (Russia)--Social conditions--Congresses.
Princeton subject headings:
Volga River Region (Russia)--Politics and government--Congresses.
Volga River Region (Russia)--Social conditions--Congresses.