Papers of the American painter, art critic. Correspondence, 1910-1969; holograph and typescript essays, lectures, and speeches; photographs; and printed material, including articles, exhibition catalogs, and material relating to the National Academy of Design, of which Clark wrote a history.

Correspondence (1937-1965); personal papers (1950-1952); photographs of Harriton and his work (1918-1962); manuscripts by Harriton on art and artists (1949-1964); scrapbooks (1915-1962); published material (1922-1964); and biographical material.