The collections consists primarily of manuscripts of Thayer's works, including personal notes, publisher/editor corrections and correspondence, and some public response. Also included are various newspaper and magazine articles featuring the author.

Contains draft notes for Thayer's work "The Gold Mine." Materials pertain to the publication, and include consecutive drafts of the work with author's commentary. Also includes correspondence with publishers and responses. Also includes one published manuscript of "The Gold Mine" and "Greg" in the Horizon magazine. Dated circa 1971-2005.