The F. O. Matthiessen Papers document the work and life of historian, literary critic, and educator F. O. Matthiessen. The papers consist of personal and professional correspondence, drafts of writings, notebooks, agendas, teaching materials, photographs, printed materials, and personal papers, spanning the years 1900-1964. The bulk of the collection consists of Matthiessen's correspondence and writing drafts and original material collected by Louis Hyde in the process of researching and writing Rat & the Devil: Journal Letters of F. O. Matthiessen and Russell Cheney.