"The Design of Mine Structures" by Milo S. Ketchum [facsimiles], 1913

"The Design of Mine Structures" by Milo S. Ketchum [facsimiles], 1913, Box: 142, Folder: 1. 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/188330 Accessed November 16, 2024.