The Robert David Cohen Papers include correspondence from Robert Sward and Ann Quin to Cohen, written while Cohen lived in Mexico in 1968-1969, as well as poetry manuscripts written by Cohen alone and by the three authors together. The collection also contains a notebook by Cohen which held notes about Sward and notes toward The Play, a collaborative work by Sward and Cohen.

The Donald Finkel Papers include his extensive research materials, journals, notes, and heavily revised manuscripts. A large collection of editorial matter toward all of his books and a small, yet revealing professional correspondence with editors and literary colleagues completes the Finkel Papers.

The Isabella Gardner Papers contain manuscript and editorial material toward most of her books drafts of individual poems as well as letters to and from various editors, friends, and family.

The Arthur C. Hoskins collection contains items directly related to Hoskins and his family, including correspondence and records of expenses, and also items related to Missouri Historical Society activities. Certain items, which are connected to material previously collected by Hoskins, but whose source is unknown, have been placed in the collection because of their convenient connection.

The David Jackson Papers consists of extensive correspondence, photographs of family and friends, and manuscript material towards Jackson’s poems, stories, and plays.

The collection holds a wide variety of materials that document James Ingram Merrill's entire life.

The extensive correspondence is between Merrill and his family, friends, business associates, and others. Thousands of pages of heavily annotated notebooks, typescripts, worksheets, and galleys show Merrill's work towards poems, fiction, and drama. The audiovisual and personal material document other aspects of Merrill's life.