Mills, William W.. Forty years at El Paso, 1858-1898; recollections of war, politics, adventure, events, narratives, sketches, etc., by W. W. Mills., Book, 1901; digital images, (http://texashistory.unt.edu/ark:/67531/metapth6112/ : accessed July 14, 2014), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries, Denton, Texas.
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