Columbia subject headings:
Harvard subject headings:
Caucasus--Relations--Russia.
Chaadaev, P. I︠A︡. (Petr I︠A︡kovlevich), 1794-1856
Russia--Ethnic relations.
Russia--Intellectual life.
Russia--Relations--Caucasus.
Princeton subject headings:
Caucasus--Relations--Russia.
Chaadaev, P. I︠A︡. (Petr I︠A︡kovlevich), 1794-1856.
Russia--Ethnic relations.
Russia--Intellectual life.
Russia--Relations--Caucasus.