Columbia subject headings:
Lopatin, Lev Mikhaĭlovich, 1855-1920.
Philosophers--Russia--Biography.
Harvard subject headings:
Lopatin, Lev Mikhaĭlovich, 1855-1920.
Philosophers--Russia--Biography
Princeton subject headings:
Lopatin, Lev Mikhaĭlovich, 1855-1920.
Philosophers--Russia--Biography.