Correspondence, journals, lectures, writings, transcripts of radio broadcasts, financial records, scrapbooks, photographs, and other papers relating chiefly to Deuel's career as a journalist with the Chicago Daily News and the St. Louis Post-Dispatch. Includes material pertaining to his work as diplomatic correspondent in Berlin, Germany, prior to World War II. Also documents his service as an intelligence officer with the U.S. Office of Strategic Services during World War II, a special assistant with the Allied Forces Supreme Headquarters, and a foreign intelligence analyst with the U.S. Central Intelligence Agency. Includes drafts of his book People under Hitler (1942), biographical sketches of Deuel's contemporaries, and a file on Dean Acheson. Also includes genealogical material and Deuel (Duell) family papers consisting of correspondence, clippings, memorabilia, photographs, and other papers. Family members represented include Deuel's wife, Mary Virginia Deuel, and their sons, Michael McPherson Deuel and Peter MacArthur Deuel.

Correspondents include Dean Acheson, William J. Donovan, Allen Dulles, George Kennan, Frank Knox, Joseph Pulitzer, and Adlai E. Stevenson.