Columbia subject headings:
Harvard subject headings:
Chaadaev, P. I︠A︡. (Petr I︠A︡kovlevich), 1794-1856--Political and social views.
Chaadaev, P. I︠A︡. (Petr I︠A︡kovlevich), 1794-1856--Views on Russian politics.
Philosophers--Soviet Union--Biography
Princeton subject headings:
Chaadaev, P. I︠A︡. (Petr I︠A︡kovlevich), 1794-1856.
Philosopers--Soviet Union.