Columbia subject headings:
Petrashevsky Group.
Russia--History--1801-1917.
Socialism--Soviet Union.
Harvard subject headings:
Petrashevsky Group
Russia--History--Nicholas I, 1825-1855.
Socialism--Russia.
Socialism--Soviet Union
Princeton subject headings:
Petrashevsky Group.
Russia--History--Nicholas I, 1825-1855.
Socialism--Russia.