Columbia subject headings:
Caucasus, Northern (Russia)--History--20th century.
Don River Region (Russia)--History--20th century.
Socialism--Russia (Federation)--Caucasus, Northern.
Socialism--Russia (Federation)--Don River Region.
Harvard subject headings:
Caucasus, Northern (Russia)--Economic conditions.
Caucasus, Northern (Russia)--History--Revolution, 1917-1921.
Don River Region (Russia)--Economic conditions.
Don River Region (Russia)--History--Revolution, 1917-1921.
Princeton subject headings: