Columbia subject headings:
Cossacks--Russia (Federation)--Ural Mountains Region--History.
Harvard subject headings:
Cossacks--Russia (Federation)--Ural Mountains Region--History--20th century.
Cossacks--Russia (Federation)--Ural Mountains Region--History.
Ural Mountains Region (Russia)--History--20th century.
Princeton subject headings:
Cossacks--Russia (Federation)--Ural Mountains Region--History--20th century.
Ural Mountains Region (Russia)--History--20th century.