Smithers, W. D. (Wilfred Dudley), 1895-1981. Supply routes to troops in the Big Bend District of Texas 1916-1920. Map, map, Date Unknown; (https://texashistory.unt.edu/ark:/67531/metapth11950/m1/1/: accessed July 10, 2020), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .