D.T. Williams Valve Company, 1919, Box: Series 3, Box 15, Folder: 5. Ward Engineering Company Archives and Manuscripts, A&M 2298. West Virginia and Regional History Center.
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D.T. Williams Valve Company, 1919, Box: Series 3, Box 15, Folder: 5. Ward Engineering Company Archives and Manuscripts, A&M 2298. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/143727 Accessed December 23, 2024.