General soil map of Texas, map, 1931; (https://texashistory.unt.edu/ark:/67531/metapth19672/m1/1/: accessed September 25, 2023), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
General soil map of Texas, map, 1931; (https://texashistory.unt.edu/ark:/67531/metapth19672/m1/1/: accessed September 25, 2023), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .