The collection consists of correspondence, writings, photographs, scrapbooks, personal papers, printed material, and realia relating to the life and work of Marian Cox, spanning the years 1882 to 1972, with the bulk of the materials dating between 1907 and 1963. Papers include correspondence relating chiefly to social engagements, writings by Cox (drafts and printed versions), auction catalogs from Cox's homes in New York and Connecticut, and books inscribed to Cox by their authors. Scrapbooks contain biographical information on Cox as well as clippings of articles written by and about Cox. Photographs include portraits of Cox, her friends, and her homes. Objects include shoes and dresses worn by Cox.