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Phalen, Henry J.Improved Apparatus for Heating Water and Condensing Steam.,
patent,
October 1, 1867;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth165141/:
accessed June 30, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.;
crediting UNT Libraries Government Documents Department.