The Pittsburgh Bridge Company, Holes for River Heads in Wing Plates on Top Shoe of "B" Columns, Blueprint, undated

The Pittsburgh Bridge Company, Holes for River Heads in Wing Plates on Top Shoe of "B" Columns, Blueprint, undated, Box: 89, Item: 101. 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/155823 Accessed November 22, 2024.