Columbia subject headings:
Harvard subject headings:
Lavrov, P. L. (Petr Lavrovich), 1823-1900
Populism--Soviet Union--History--19th century.
Revolutionaries--Soviet Union--Biography
Princeton subject headings:
Lavrov, P. L. (Petr Lavrovich), 1823-1900.
Populism--Soviet Union--History--19th century.
Socialism--Soviet Union--History--19th century.
Socialists--Soviet Union--Biography.