Columbia subject headings:
Harvard subject headings:
Authors, Russian--20th century--Correspondence
Freĭdenberg, O. M. (Olʹga Mikhaĭlovna), 1890-1955.--Correspondence.
Pasternak, Boris Leonidovich, 1890-1960--Correspondence.
Princeton subject headings:
Authors, Russian--20th century--Correspondence.
Freĭdenberg, O. M. (Olʹga Mikhaĭlovna), 1890-1955.
Pasternak, Boris Leonidovich, 1890-1960--Correspondence.