Columbia subject headings:
Soviet Union--History--Revolution, 1917-1921--Influence.
Ural Mountains Region (Russia)--Economic conditions.
Ural Mountains Region (Russia)--History.
Harvard subject headings:
Soviet Union--History--Revolution, 1917-1921--Influence.
Ural Mountains Region (Russia)--Economic conditions.
Ural Mountains Region (Russia)--History.
Princeton subject headings: