The American Iron and Steel Institute is a trade association of North American steel producers. The group’s mission includes advocating for public policy, education and innovation for the Iron and Steel Industry. The Institute was established under the leadership of Elbert H. Gary (1846-1927) in 1908, after the Panic of 1907 brought an end to industry-wide consolidations. This collection consists of photographs, research notes, audio, film, and video which document the history of the steel industry. The images cover the entire scope of the steel industry from basic raw materials through the multiple aspects of steelmaking. In addition to images documenting the technical aspects of steel production, there are photographs showing steel in use. These include a variety of industrial and consumer applications and images related to the steel industry and environmental issues. The Albert T. Keller (1869-1940) photographs depict the sites or remains of early ironworks primarily in the mid-Atlantic states and New England states during the 1930s and there are over fifty blast furnace complexes pictured. The Walter C. Woodman (1903-1979) photographs and research notes document the history of iron furnaces and Saugus Iron Works becoming a national historic landmark.

The Associated Factory Mutual Fire Insurance Companies comprised twenty-eight mutual insurance firms that specialized in industrial fire insurance. The collection consists of seventy original hand-colored plans and maps primarily depicting textile mills, paper products factories and foundries in New England and New York.

Betts & Seal was an iron foundry in Wilmington, Delaware that operated under that name from 1857 to 1867, but was established in 1828. The Betts family of Wilmington, Delaware, produced three generations of innovative founders and machinists. The records of Betts & Seal cover the operation of the foundry from 1828 to 1867. The result is a rare time-capsule look at the workings of a small but innovative foundry during the first phase of American industrialization.

The Christiana Machine Company was a small, general purpose machine shop and foundry located in Christiana, Lancaster County, Pennsylvania. This small collection includes incoming and outgoing correspondence related to orders following the buyout of Nathan F. Burnham's interest by the Broomells in January 1889.

The Christiana Machine Company is a small, general purpose machine shop and foundry located in Christiana, Lancaster County, Pennsylvania. Their records cover the operation of the company under the Broomells and Burnham from 1877 to 1915 and are typical of the records of a small machine shop.

The Erie City Iron Works was founded by Pennsylvania capitalist Bethuel Boyd Vincent (1803-1876) as the Presque Isle Foundry in 1840. The Works was a major manufacturer of boilers, stationary and portable engines and machinery for sawmills and steam riveting as well as railroad freight and passenger cars. Their records are largely comprised of accounting records.

Lukens Steel Company was a medium-sized producer of specialty steel products and one of the top three U.S. producers of steel plate. The Lukens Steel Company records documents all aspects of the business from the early nineteenth century through the 1970s.

The Midvale Steel Company manufactured steel parts and was known for casting, forging, and machining high-quality steels, including alloy steels, and precision steel products for a wide array of industries. Their primary business came from work related to railroad and ordnance manufacturing. This small collection consists of five reels of film that document operations at the Midvale Steel Plant in the Nicetown section of Philadelphia. While the reels are not dated, they are believed to be from 1919. The films document the various stages of production at the plant with a focus on the precision steel making processes for which Midvale was known.

The Midvale Steel Company manufactured steel parts for the railroad industry and the armaments industry. The company was known for casting, forging, and machining high-quality steels, including alloy steels. This album contains photographs showing exteriors and interiors of Midvale Steel facilities in the Nicetown area of Germantown.

National Bronze and Aluminum Foundry Company was a manufacturer of cast aluminum products, primarily for the automotive industry, headquartered in Cleveland, Ohio. During World War II, the company was part of the nation's defense, producing aluminum castings for airplanes and tanks. This small collection consists of directors meeting minutes and shareholders meeting minutes dating from 1937 to 1941 and 1945 to 1949. This collection would be of interest to those researching pre- and post-war financial and legal issues surrounding manufacturers required to produce goods during wartime and recovering from major turnover.

The Speakman Company manufactures plumbing supplies and has been in business in Wilmington, Delaware since 1869. This small collection consists primarily of manufacturing operations in 1951 and one image of Speakman Company delivery trucks, dating around 1920.