Panama Canal Company, Engineering and Construction Bureau, Engineering Division, Balboa Heights, Panama, Canal Zone, Plans and Layouts for Balboa Bridge, Balboa, Panama, Canal Zone, Blueprints, 1950 January 1-1969 September 1

Panama Canal Company, Engineering and Construction Bureau, Engineering Division, Balboa Heights, Panama, Canal Zone, Plans and Layouts for Balboa Bridge, Balboa, Panama, Canal Zone, Blueprints, 1950 January 1-1969 September 1, Box: 116, Item: 300. 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/156024 Accessed December 05, 2025.