Columbia subject headings:
Polish people--Political activity--Russia.
Russia--Politics and government--1894-1917.
Socialism--Russia.
Harvard subject headings:
Polish people--Soviet Union--Political activity--History.
Russia--Politics and government--1894-1917.
Socialism--Soviet Union--History
Princeton subject headings:
Polish people--Russia--Political activity--History.
Russia--Politics and government--1894-1917.
Socialism--Russia--History.