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Shugart, T. Woodward. & Clifton, Charley D. Insecticide., patent, January 8, 1886; (https://texashistory.unt.edu/ark:/67531/metapth171163/m1/1/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .