Eriksen, Eduard A. O. & Day, William Howell. Hoe Attachment for Cultivators., patent, February 14, 1893; (https://texashistory.unt.edu/ark:/67531/metapth173308/m1/2/: accessed July 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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