Manuscripts, notes, lecture materials, and papers of Hayes. There are six boxes of correspondence, notes, and documents relating to the war years, 1942-1945, when Prof. Hayes served as Ambassador to Spain. The collection also includes the notes, drafts, and typescripts of Prof. Hayes' publications including his books Wartime Mission in Spain, 1942-1945 (New York, 1945), History of Europe (New York, 1956), A Political and Cultural History of Modern Europe (New York, 1932-1936), Generation of Materialism (New York, 1941), Christanity and Western Civilization (Stanford, 1954), and Contemporary Europe Since 1970 (New York, 1958). There are also notes and typescripts of an "Autobiography," which is apparently unpublished. Included in the collection are two boxes of catalogued correspondence.