Columbia subject headings:
College teachers--United States--Correspondence.
Cox, Sidney, 1889-1952.
Frost, Robert, 1874-1963--Correspondence.
Poets, American--20th century--Correspondence.
Harvard subject headings:
College teachers--United States--Correspondence.
Cox, Sidney, 1889-1952.
Frost, Robert, 1874-1963. Correspondence
Poets, American--20th century--Correspondence
Princeton subject headings:
College teachers--United States--Correspondence.
Cox, Sidney, 1889-1952.
Frost, Robert, 1874-1963. Correspondence.
Poets, American--20th century--Correspondence.