The Koppers Construction Company, Pittsburgh, Pennsylvania, Blueprints of Projects, August 1962

The Koppers Construction Company, Pittsburgh, Pennsylvania, Blueprints of Projects, August 1962, Box: 87, Item: 72. Institute for the History of Technology and Industrial Archaeology Records, A&M 3936. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/155794 Accessed November 22, 2024.