Columbia subject headings:
Revolutionaries--Soviet Union--Biography.
Tkachev, Petr Nikitich, 1844-1886.
Harvard subject headings:
Revolutionaries--Soviet Union--Biography
Tkachev, Petr Nikitich, 1844-1886
Princeton subject headings:
Revolutionaries--Soviet Union--Biography.
Tkachev, Petr Nikitich, 1844-1886.