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