Columbia subject headings:
Authors, Russian--20th century--Correspondence.
Pasternak, Boris Leonidovich, 1890-1960--Correspondence.
Harvard subject headings:
Authors, Russian--20th century--Correspondence
Pasternak, Boris Leonidovich, 1890-1960--Correspondence.
Princeton subject headings:
Authors, Russian--20th century--Correspondence.
Pasternak, Boris Leonidovich, 1890-1960--Correspondence.