Mixed boxes consisting of materials relating to Otto Duke's career in mining engineering, as well as personal material, between 1919 and 1975.

This series contains Otto Duke's family papers dating from 1933-1975. Includes bills, correspondence, information about the Salt Lake Home, correspondence in behalf of his son Keith, birthday cards, postcards/memorabilia/souvenirs from Alaska, Arizona, and other places.

Includes diagrams and materials dealing with projects for the Columbia Steel Company, such as crane lists, engineering personnel list, letters regarding Otto Duke's attempts to get a job there, and other diagrams and blueprints. Includes materials form 1941 to 1944.

Otto Duke was secretary-treasurer of the Intermountain Alumni Association of the Theta Tau fraternity. This series deals with that association and includes correspondence, monthly luncheon attendance, "The Gear of Theta Tau," receipts, 40th anniversary meeting planning, "Balfour Blue Book," and minutes of biennial Theta Tau conventions. Dates range from 1955 to 1969.