Columbia subject headings:
Caucasus, Northern (Russia)--Economic conditions.
Cities and towns--Russia (Federation)--Caucasus, Northern--History--19th century.
Railroads--Russia (Federation)--Caucasus, Northern--History--19th century.
Urbanization--Russia (Federation)--Caucasus, Northern--History--19th century.
Harvard subject headings:
Caucasus, Northern (Russia)--Economic conditions.
Cities and towns--Russia (Federation)--Caucasus, Northern--History--19th century.
Railroads--Russia (Federation)--Caucasus, Northern--History--19th century.
Urbanization--Russia (Federation)--Caucasus, Northern--History--19th century.
Princeton subject headings:
Caucasus, Northern (Russia)--Economic conditions.
Cities and towns--Russia (Federation)--Caucasus, Northern--History--19th century.
Railroads--Russia (Federation)--Caucasus, Northern--History--19th century.
Urbanization--Russia (Federation)--Caucasus, Northern--History--19th century.