Monongahela River, Pennsylvania, Proposed Lock and Dam No. 7, Borings, Blueprint, 1921 August 31

Monongahela River, Pennsylvania, Proposed Lock and Dam No. 7, Borings, Blueprint, 1921 August 31, Box: 81, Item: 35. 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/155757 Accessed November 22, 2024.