Texas (Zapata County): San Ygnacio Quadrangle Grid Zone "D", map, 1956; (https://texashistory.unt.edu/ark:/67531/metapth493350/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Texas (Zapata County): San Ygnacio Quadrangle Grid Zone "D", map, 1956; (https://texashistory.unt.edu/ark:/67531/metapth493350/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .