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Hale, Nathan.Improvement in Cotton Scrapers and Choppers.,
patent,
November 8, 1870;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth165256/:
accessed April 18, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting UNT Libraries Government Documents Department.