Columbia subject headings:
Harvard subject headings:
Chaadaev, P. I︠A︡. (Petr I︠A︡kovlevich), 1794-1856
Dostoyevsky, Fyodor, 1821-1881
Princeton subject headings:
Chaadaev, P. I︠A︡. (Petr I︠A︡kovelich), 1794-1856.
Dostoyevsky, Fyodor, 1821-1881.
Philosophers--Russia.