General Soil Map, Starr County, Texas, map, 1971; (https://texashistory.unt.edu/ark:/67531/metapth224552/m1/1/: accessed May 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
General Soil Map, Starr County, Texas, map, 1971; (https://texashistory.unt.edu/ark:/67531/metapth224552/m1/1/: accessed May 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .