Amos Fries (1873-1963) was an engineer, served in the Philippines during the Moro uprising, organized the Chemical Warfare Service, and was an advocate for conservative causes. The collection consists of biographical material, correspondence, manuscripts by Fries, others, and Elizabeth Fries, and photographs.

Harold A. Rands (1871-1952) was a civil engineer who superintended hydroelectric installations, was in charge of power and flood control surveys on the Columbia River and tributaries for the U. S. Corp of Engineers, and served as senior engineer for the construction of the Bonneville Dam and powerhouse complex. The collection contains field diaries, correspondence, reports, project files including Columbia river and Bonneville Dam projects, and photographs.

Thomas Matthew Robins was a native of Maryland who graduated from West Point and served in Cuba in 1908 and in World War I. He later moved to Portland, Oregon where he was in charge of construction of the Bonneville Dam. Collection contains engineering project and research files, speeches, correspondence, personal information and photographs.