These papers document the scholarly work of Charles Upson Clark through correspondence, writings, and ephemera. His writings include book reviews and an unpublished memoir, "Platform Ramblings.". Also included are his notes, likely from his student years, on topics such as biology, languages, and philosophy. His ephemera includes pre-printed greetings and announcement postcards he created to promote his lecture tours, as well as collected cards from his childhood. There is also a document in Arabic and one photograph of Clark in 1954.