Railroad Survey Crew Poses Along the Side of a Ravine, c. 1902, Photograph, ca. 1902; (http://texashistory.unt.edu/ark:/67531/metapth3349/ : accessed December 29, 2014), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting Irving Archives, Irving, Texas.
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