Herrera, John J. [Letter from John J. Herrera to Neville G. Penrose - 1953-07-23], letter, July 23, 1953; (https://texashistory.unt.edu/ark:/67531/metapth250406/m1/1/: accessed May 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .