Columbia subject headings:
Harvard subject headings:
Vishnevskiĭ, Vsevolod, 1900-1951--Friends and associates.
Wolf, Friedrich, 1888-1953--Friends and associates.
Princeton subject headings:
Vishnevskiĭ, Vsevolod, 1900-1951--Friends and associates.
Wolf, Friedrich, 1888-1953--Friends and associates.