Columbia subject headings:
Harvard subject headings:
Dolgorukiĭ, Ivan Mikhaĭlovich, kni︠a︡zʹ, 1764-1823--Friends and associates.
Princeton subject headings:
Dolgorukiĭ, Ivan Mikhaĭlovich, kni︠a︡zʹ, 1764-1823--Friends and associates.