600 I.H.P. Towboat, Twin Screw Tunnel Type (designed by Ward Engineering for Vesta Coal Company, Pittsburgh, PA), undated

600 I.H.P. Towboat, Twin Screw Tunnel Type (designed by Ward Engineering for Vesta Coal Company, Pittsburgh, PA), undated, Box: Series 11, Box 1, Folder: 6. Ward Engineering Company Archives and Manuscripts, A&M 2298. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/144422 Accessed December 23, 2024.