Columbia subject headings:
Popov, M. R. (Mikhail Rodionovich), 1851-1909.
Revolutionaries--Soviet Union--Correspondence.
Zemli︠a︡ i voli︠a︡ (Political party : Russia)
Harvard subject headings:
Princeton subject headings:
Popov, M. R. (Mikhail Rodionovich), 1851-1909.
Revolutionaries--Soviet Union--Biography.
Zemli︠a︡ i voli︠a︡ (Political party).