Soil map, Texas, Vernon sheet, map, 1902; (https://texashistory.unt.edu/ark:/67531/metapth19667/m1/1/: accessed September 22, 2023), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Soil map, Texas, Vernon sheet, map, 1902; (https://texashistory.unt.edu/ark:/67531/metapth19667/m1/1/: accessed September 22, 2023), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .