General Soil Map, Armstrong County, Texas, map, December 1963; (https://texashistory.unt.edu/ark:/67531/metapth130271/m1/1/: accessed May 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
General Soil Map, Armstrong County, Texas, map, December 1963; (https://texashistory.unt.edu/ark:/67531/metapth130271/m1/1/: accessed May 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .