The Ray M. and Leonard H. Grimshaw collection relates primarily to the military service of Ray M. Grimshaw during World War I. The collection contains correspondence, military documents, photographs, postcards, diary, booklets, and ephemera related to Ray's time with the 95th Aero Squadron, where he served as a mechanic. There is also a small amount of correspondence from his older brother, Leonard H. Grimshaw, who also served in World War I.