| http://www.w3.org/ns/prov#value | - 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 includes that of fellow artists (Karl Anderson, Pietro Annigoni, John Taylor Arms, Edwin Dickinson, Ralph Fabri, Harry Hoffman, Anna Hyat
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