Columbia subject headings:
Volga River Region (Russia)--History--Revolution, 1917-1921.
Volga River Region (Russia)--Politics and government--20th century.
Volga River Region (Russia)--Social conditions--20th century.
Harvard subject headings:
Volga River Region (Russia)--History--Revolution, 1917-1921.
Volga River Region (Russia)--Politics and government--20th century.
Volga River Region (Russia)--Social conditions--20th century.
Princeton subject headings:
Volga River Region (Russia)--History--Revolution, 1917-1921.
Volga River Region (Russia)--Politics and government--20th century.
Volga River Region (Russia)--Social conditions--20th century.