North of Port Isabel Southwest Quadrangle, map, 2013; (https://texashistory.unt.edu/ark:/67531/metapth451455/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
North of Port Isabel Southwest Quadrangle, map, 2013; (https://texashistory.unt.edu/ark:/67531/metapth451455/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .