The James Laughlin Collection contains typescripts and autograph manuscripts, many with corrections, for approximately 835 poems; and 39 letters from Laughlin to individuals such as Charles D. Abbott, Peter Russell, and Robert Bertholf.

The Marc Widershien Collection contains manuscripts for over a dozen books and chapbooks, many of them self-published; his dissertation (1979); manuscripts of individual articles and reviews; a collection of many of his first appearances; letters; and various personal items.

The Osiris Collection, 1972-2021, contains material related to the production of the magazine as well as Andrea Moorhead's personal career. The bulk of the material is correspondence. Other material includes business financial material and production material for Osiris; and manuscripts, correspondence, acceptance letters, and publications documenting Andrea Moorhead's poetry and translation career. Osiris is still an actively publishing magazine. The material in this collection documents the life of Osiris until 2013.