Columbia subject headings:
Poor--Russia--History--Sources--Bibliography.
Russia--Social conditions--1801-1917--Sources--Bibliography.
Working class--Russia--History--Sources--Bibliography.
Harvard subject headings:
Poor--Russia--History--Sources--Bibliography.
Russia--Social conditions--1801-1917--Sources--Bibliography.
Working class--Russia--History--Sources--Bibliography.
Princeton subject headings:
Poor--Russia--History--Sources--Bibliography.
Russia--Social conditions--1801-1917--Sources--Bibliography.
Working class--Russia--History--Sources--Bibliography.