United States Department of the Interior, National Park Service, Historic American Engineering Record, Anthracite Coal Region, Pennsyvania, St. Nicholas Breaker in the Schuylkill Coal Field, Map and Blueprints, 2000 March 21

United States Department of the Interior, National Park Service, Historic American Engineering Record, Anthracite Coal Region, Pennsyvania, St. Nicholas Breaker in the Schuylkill Coal Field, Map and Blueprints, 2000 March 21, Box: 132, Item: 342. 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/156066 Accessed January 23, 2025.