Hyer, Robert Stewart. Plow., Patent, March 3, 1891; digital images, (http://texashistory.unt.edu/ark:/67531/metapth172625/ : accessed May 24, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries Government Documents Department, Denton, Texas.
Plow.
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