The surviving records of the Cambria Steel Company consist largely of correspondence files of the Engineering Department, ca. 1909-1923. These files (principally kept by E. T. Gray, Chief Engineer) are concerned with construction work at the various facilities in the Johnstown area. Among the projects best represented are flood control measures along the Conemaugh River, dams and pipelines for the subsidiary water companies, and war-related expansion of the various steel plants. There is also a substantial amount of material on the construction of workers' and managers' housing, particularly in the Westmont, Shady Lane, and Overbrook developments. The construction of houses and the laying-out of streets, sewers and plantings is well documented. Of special note are investigations of all-concrete houses designed by the Van Guilder Double Wall Company, Inc. The Engineering Department files also contain a small amount of information on the company's welfare work and its Cambria Library Night School and on safety meetings. There is also an incomplete series of Cost of Improvement ledgers with accounting for the many additions to the plants between 1894 and 1911.

There is also a small sample of corporate records including scattered annual reports, stockholder mailings, income statements, and a copy of the Cambria Iron Company lease. All other corporate records, including minute books, have been destroyed.

George A. Richardson (1886-1976) was an engineer with an expertise in metallurgy, he spent his career primarily involved in technical publicity and sales for major steel manufacturers such as the Midvale Steel & Ordnance Company and the Bethlehem Steel Corporation. This collection of photographs and negatives was primarily taken by George Atwell Richardson throughout the course of his career while working for Midvale Steel and Ordnance Company and the Bethlehem Steel Corporation. The images document views of steel plants and operations, as well as steel products mostly taken between 1913 and 1929. The collection has been organized into five series: Midvale Steel and Ordnance Company; Cambrian Steel Company; Bethlehem Steel Corporation; Exhibits, and Other steel and coal companies.

The photographs of Bethlehem plants and steel-related enterprises within Pennsylvania are composed of steel plants at Lebanon, Lehigh, Northampton, Saucon and Williamsport. There are also photographs from the Johnstown plant; this includes some early Cambria Iron Company images. These are industrial photos, as well as photographs of the community. The Johnstown material also contains thousands of glass plates negatives and forty-seven albums of company photographs made up from a selection of negatives. Most of these show steel mill construction, renovation, construction of the water supply system, homes, safety posters and devices, and first aid drills. The negatives date from 1900 to 1917. The albums are mostly composed of photographs showing Franklin Mill and open hearth and blast furnaces, Gautier mill, steel mill construction, renovation, coke plant, rod and wire mills, construction of water supply systems, safety posters and devices, and first aid drills. An oversize album of plant views (1919) drawn by commercial artist Edward Spofford (1895-1940) shows many of the Bethlehem Steel and Shipyards plants.