Columbia subject headings:
Singers--Soviet Union--Biography.
Sobinov, Leonid Vitalʹevich, 1872-1934.
Harvard subject headings:
Singers--Soviet Union--Biography
Sobinov, Leonid Vitalʹevich, 1872-1934.
Princeton subject headings:
Singers--Soviet Union.
Sobinov, Leonid Vitalʹevich, 1872-1934.