Kalteyer, George H. Process of Preparing and Tempering Slurry for Portland Cement., patent, September 29, 1891; (https://texashistory.unt.edu/ark:/67531/metapth172801/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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