Columbia subject headings:
Ershov, P. P. (Petr Pavlovich), 1815-1869. Konek-Gorbunok.
Harvard subject headings:
Ershov, P. P. (Petr Pavlovich), 1815-1869. Konek-Gorbunok.
Princeton subject headings:
Ershov, P. P. (Petr Pavlovich), 1815-1869. Konek-Gorbunok.