Columbia subject headings:
Harvard subject headings:
Radicalism--Russia--History--19th century.
Revolutionaries--Russia
Revolutionaries--Russia--Biography
Russia--Politics and government--1855-1881.
Tkachev, Petr Nikitich, 1844-1886
Princeton subject headings:
Blanqui, Auguste, 1805-1881--Influence.
Revolutionaries--Russia.
Socialism--Russia--History.
Tkachev, Petr Nikitich, 1844-1886.