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Sears, James E.Improvement in Apparatus for the Manufacture of Ice.,
patent,
August 29, 1871;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth165293/:
accessed June 20, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.;
crediting UNT Libraries Government Documents Department.