Correspondence, memoranda, notes, manuscripts, addresses, and printed materials of Macmahon, including his course outlines and lecture notes, travel logs, and extensive files of notes and manuscripts on aspects of federalism and governmental administration. Charles A. Beard and Randolph S. Bourne were both personal friends of Macmahon, and the files contain letters from them as well as notes and correspondence relating to them. Also, a three-volume bound photocopy of the typescript of Macmahon's "Conflict and Consensus in Democracies" 1969.