Professor. Correspondence (1918–1920) regarding his books, Propaganda For War and Opponents of War, from readers and notables, including Norman Thomas, George Creel, J. Edgar Hoover, and Roger Baldwin; manuscripts and galley proofs of the two books; scrapbooks (1918–1920) containing reviews and news items regarding his books; Peterson’s research notes (n.d.) on the loyalty oath in Oklahoma, including that of the University of Oklahoma; typescripts of a journal (1918–1919) kept by Ike Hoover, a member of President Woodrow Wilson’s party in Paris, France, after World War I, and a report on the negotiations for peace and an eventual peace treaty; and publications (1917–1951) regarding propaganda and World War I. Also included in this collection is a typescript account (1952) of Peterson’s accidental death in a University of Oklahoma classroom building, written by Alfred B. Sears and including Sears’s recommendations for removing the hazards which contributed to the death.