United States Department of the Army, U.S. Corps of Engineers, Project Plan for Monongahela River, Lock 7, Greensboro, Greene County, Pennsylvania, Blueprints, 1923 June 1

United States Department of the Army, U.S. Corps of Engineers, Project Plan for Monongahela River, Lock 7, Greensboro, Greene County, Pennsylvania, Blueprints, 1923 June 1, Box: 108, Item: 287. 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/156011 Accessed June 30, 2024.