Allegheny County, McKeesport, Pa., Industry: View of the Hot Strip Mill at the Irvin Works located on the Monongahela River, 0367B
postcard, 3 1/2 in. x 5 1/2 in.; This collection of approximately 29,000 postcards from the 1880s to the 1970s includes images from across the U.S. and all 67 Pennsylvania counties and highlights cities, towns, buildings, local businesses and industries, parks, and scenic and street views. Additional images include business and industry advertising, highways, states, and foreign countries.