Series 1 consists of autograph and typed letters from Eugene O'Neill to 17 recipients, including: Cynthia Chapman Barnett, Carol Bird, Ernest Boyd, Whit Burness, St. John Ervine, Norman Hapgood, Horace Liveright, Richard Madden, Jane Malmgren, Leon Mirlas, Lester Roberts, Milton Salsbury, Robert Sick, Nellie Tharsing, Maurice Wertheim, etc. Arranged alphabetically by sender's last name, 92 items total.

Series 2 consists of autograph manuscripts, typescripts with manuscript corrections, carbon typescripts, galley proofs and presentation scripts by Eugene O'Neill. In addition to many play scripts, this series includes a poem, film treatment and two essays. Arranged chronologically.

Autograph, 1 page. Buenos Aires, earliest known poem by O'Neill, unpublished. Item description

Typescript, signed, 4 pages. Provincetown. Letter to the Dramatic Editor of the New York Times under "The Mail Bag" section. Includes photocopy, December 18, 1921. Item description

Typescript [carbon] with extensive manuscript annotations by O'Neill throughout, 123 pages. Kenneth Macgowan's copy. Also includes a photocopy of manuscript. Item description

Transcription of letter. Includes photocopy of transcription

Transcription of letter. Includes photocopy of transcription

Autograph, 1 page. Bermuda. Also includes correspondence between Harley J. Hammerman and Louis Sheaffer, 1985-1988 (3 items) and a photocopy of correspondence between Louis Sheaffer and Oona O'Neill Chaplin, 1984 (1 item). Item description