Columbia subject headings:
Socialists--Russia (Federation)--Volga River Region.
Soviet Union--History--Revolution, 1917-1921.
Volga River Region (Russia)--History--Revolution, 1917-1921.
Harvard subject headings:
Socialists--Russia (Federation)--Volga River Region.
Soviet Union--History--Revolution, 1917-1921.
Volga River Region (Russia)--History--Revolution, 1917-1921.
Princeton subject headings: