Columbia subject headings:
Lavrov, P. L. (Petr Lavrovich), 1823-1900.
Harvard subject headings:
Lavrov, P. L. (Petr Lavrovich), 1823-1900
Lavrov, P. L. (Petr Lavrovich), 1823-1900--Biography.
Revolutionaries--Russia--Biography
Princeton subject headings: