Oscar Terry Peter Beck was a testing engineer in Portland, Oregon, circa 1900-1946. Collection includes correspondence with Clifton N. McArthur and Frederick Steiwer; notes on construction jobs; documents of the Portland Cement Co.; and reports and specifications regarding engineering activities in the Portland area.

Collection consists of miscellaneous papers belonging to Frank A. Bullington, an inventor in Portland, Oregon. These include patents, designs, finances, and other documents regarding Bullington Motors.

Leslie G. Ehmann attended Benson Polytechnic High School in Portland, Oregon, joined Esco Corp. in 1936, served as an engineer and designer, and retired in 1971. He also designed lift truck components for Hyster Company. Collection includes catalogs, specifications and price lists for Esco and Hyster products, 1941-1984, including lift trucks, logging equipment, rigging equipment and swage presses; patents; and plans for an adjustable rubber coupling.

Collection includes the diary of Maria Louise Flanders, 1926-1929; specifications by Jamieson Parker for a house in Portland Heights, Portland, Oregon, for Maria Louise Flanders and Caroline Flanders; certificates; and correspondence and documents relating to Ecola State Park.

Theodore Patrick Flynn (1891-1954) was an equipment development engineer for the U.S. Forest Service, Region 6, and director of the USFS Equipment Laboratory in Portland, Oregon, 1936-1949. Collection includes biographical materials, patents, blueprints, specifications, reports, photographs, clippings, a photo album, and memorabilia regarding design of specialized equipment used in forestry and construction work, particularly for controlling forest fires.

Collection consists of specifications and 12 sheets of plans for a residence in Portland, Oregon. The house was designed for Lewis H. Mills and Elinor Lawrence Mills, and built at 655 Irving St. (now 2039 NW Irving St.).

Diaries, notebooks, and other papers of Joseph Paquet (1841-1924), an Oregon shipbuilder and construction contractor. Includes notes and specifications on steamboats active on the Willamette and Columbia rivers in the late 19th and early 20th centuries.

Evan T. Phillips (1887-1961) was an estimator for George H. Buckler Company and vice president of Smith Phillips Company, both general contractors. Collection includes specification books, supplier directories, level book, and estimate books and sheets; catalogs and rosters; and blueprints for construction equipment. Also included are specifications for the Bonneville Dam, and specifications, sections, elevations and plans for the Vista St. Clair Apartments in Portland, Oregon.

Collection includes 8 photograph plans, elevations and sections on 6 sheets, as well as photocopy manuscript specifications, for the Dr. Curtis C. Strong residence at SW Park Ave. and SW Salmon St., Portland, Oregon.

Manuscript specifications for a marine-fire-box boiler, a type of steam engine, August 1889, prepared for J. B. Montgomery.