This series includes papers regarding Otto Duke's involvement with the Church of Jesus Christ of Latter-day Saints, such as talks, projects, Park Stake SLC stake missionary work, 10th Ward papers, pamphlets, booklets, and church news and literature. Also includes some articles and pamphlets about the Reorganized Church of Jesus Christ of Latter-day Saints. The bulk of the material comes from 1930 to 1946 and some from 1920 to 1975.

Includes diagrams and materials dealing with projects for the United states Smelting, Refining and Mining Company from 1924 to 1958, especially those in Alaska, Chicago, Torrence, CA, and Midvale, UT. Some of these projects include asphalt, turbine generators, tail sluice, dredge data, conveyors, a lead refinery, a zinc plant, and a crushing plant.

Includes diagrams and materials dealing with projects for the US Naval Supply Depot in Clearfield, UT, such as a dispensary project, marine barracks project, heating studies, correspondence, specifications, concrete tanks, "The Seagull" (three 1945 issues), and more. Dated 1942 to 1945.