Columbia subject headings:
Harvard subject headings:
Clowns--Soviet Union--Biography.
Princeton subject headings:
Circus--Soviet Union.
Clowns.
Engibarov, Leonid, 1935-1972.
Karandash, 1901-1983.
Nikulin, I︠U︡riĭ Vladimirovich.
Popov, Oleg, 1930-2016.