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Emmerson, Francis; Faires, Joseph; Cummins, John, R. & Faires, Jonathan, L.Plow,
patent,
May 19, 1885;
Washington D.C..
(https://texashistory.unt.edu/ark:/67531/metapth170976/:
accessed July 17, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.;
crediting UNT Libraries Government Documents Department.