Armco Culvert Manufacturers Association was a trade association comprised of road materials manufacturers and distributors from every state that focused on drainage and sewage. It was headquartered in Middletown, Ohio. This item is a typescript that provides a highly technical and detailed instructional guide to the field application of the Armco Jacking Method, a system of trenchless culvert installation developed by the Armco Culvert Manufacturers Association. Contents include a series of reports on completed jobs in a variety of locations.

Campbell Waterwheel Company specialized in traditional water wheels and how they could be used as esthetic elements in the landscape. Consequently, much of the company's work was for decorative power plants for private estates or for historic restorations. The collection consists of photographs of an unidentified electrically-powered water wheel.