Columbia subject headings:
Druzhinin, N. M. (Nikolaĭ Mikhaĭlovich), 1886-1986.
Russia--Economic conditions--1861-1917.
Russia--Economic conditions--To 1861.
Russia--Social conditions--1801-1917.
Russia--Social conditions--To 1801.
Soviet Union--Economic conditions.
Soviet Union--Social conditions.
Harvard subject headings:
Princeton subject headings:
Druzhinin, N. M. (Nikolaĭ Mikhaĭlovich), 1886-1986.
Russia--Economic conditions.
Russia--History.
Russia--Social conditions.
Soviet Union--Economic conditions.
Soviet Union--History.
Soviet Union--Social conditions.