Columbia subject headings:
Martov, L., 1873-1923.
Potresov, S. V. (Sergi︠e︡ĭ Viktorovich), 1870-1953.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡.
Russia--Politics and government--1894-1917.
Socialism.
Harvard subject headings:
Martov, L., 1873-1923
Potresov, S. V. (Sergi︠e︡ĭ Viktorovich), 1870-1953
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡.
Russia--Politics and government--1894-1917.
Socialism
Princeton subject headings: