Thomas, Robert Smith; Hardwick, Sauny Warren & Elam, William Erwin.Machine for Handling and Cleaning Seed-Cotton.,
patent,
August 25, 1891;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth172771/m1/4/:
accessed June 20, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.;
crediting UNT Libraries Government Documents Department.