The Boris Filippov Papers, 1880-2015, contain business and personal correspondence, writings of Boris Filippov, project files for books Filippov edited, writings by others, personal papers, research files, and book cover art for a number of Filippov editions. Also included are writings, research files, and other papers by or related to the life and work of Eugenia Filipoff, an essayist, cultural critic, and Boris's wife.