Columbia subject headings:
Caucasus, Northern (Russia)--Economic conditions.
Caucasus, Northern (Russia)--History.
Don River Valley (Russia)--Economic conditions.
Don River Valley (Russia)--History.
Harvard subject headings:
Caucasus, Northern (Russia)--Economic conditions.
Caucasus, Northern (Russia)--Social conditions.
Don River Region (Russia)--Economic conditions.
Don River Region (Russia)--Social conditions.
Russia--Economic conditions--1861-1917.
Russia--Social conditions--1801-1917.
Princeton subject headings: