[Entrenching on the Mexican Border], postcard, 1910/1920; (https://texashistory.unt.edu/ark:/67531/metapth187714/m1/1/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Entrenching on the Mexican Border], postcard, 1910/1920; (https://texashistory.unt.edu/ark:/67531/metapth187714/m1/1/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .