Columbia subject headings:
Isakovskiĭ, M. (Mikhail), 1900-1973--Correspondence.
Poets, Russian--20th century--Correspondence.
Russian poetry--20th century--History and criticism.
Harvard subject headings:
Authors, Russian--20th century--Correspondence
Isakovskiĭ, M. (Mikhail), 1900-1973--Correspondence.
Russian literature--History and criticism
Princeton subject headings:
Authors, Russian--20th century--Correspondence.
Isakovskiĭ, M. (Mikhail), 1900-1973. Correspondence.
Russian literature--History and criticism.