Columbia subject headings:
Dramatists, American--20th century--Correspondence.
Macgowan, Kenneth, 1888-1963.
O'Neill, Eugene, 1888-1953--Correspondence.
Harvard subject headings:
Dramatists, American--20th century--Correspondence.
Macgowan, Kenneth, 1888-1963.
O'Neill, Eugene, 1888-1953--Correspondence.
Princeton subject headings:
Dramatists, American--20th century--Correspondence.
Macgowan, Kenneth, 1888-1963.
O'Neill, Eugene, 1888-1953--Correspondence.