Maxfield, Nelson; Griffin, Richard Frankling & Speer, Henry Alson. Cultivator., patent, July 17, 1894; (https://texashistory.unt.edu/ark:/67531/metapth173769/m1/1/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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