Correspondence; writings; sketches; photographs; and clippings. Papers, ca. 1930-1971, relating to Mark's work with the WPA-FAP, New York, including correspondence with Francis V. O'Connor, National Collection of Fine Arts; essays and notes from the late 1930's, including a recollection of other project artists; sketches and photographs of paintings from that period; and a review of the Artists' Union exhibit, A.C.A. gallery, from ART FRONT, Feb. 1936. Papers, ca. 1940-1981, including: writings by Mark about influences on his art work; two essays by Mark, "A masterwork and the creative process" and "'Guernica' and 'Death to the Invader' - a personal view"; photographs of works of art; and clippings.
