Abstract: The Rust Engineering Company specialized in the design and construction of equipment and facilities for heavy industry, including furnaces, boiler settings, industrial chimneys, and entire manufacturing and processing plants. This collection documents the management of Rust Engineering's Pittsburgh, Pennsylvania, headquarters by its first two presidents, Stirling Murray Rust and Stirling Murray Rust, Jr., through correspondence, job and financial reports, meeting minutes, promotional items, newspaper clippings, and photographs.