Apparatus for Extracting Minerals from Ores. Page: 3 of 9
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Apparatus for Extracting Minerals from Ores., patent, January 13, 1920; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257177/m1/3/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.