Valdez, Frank M. [Letter from Frank M. Valdez to John J. Herrera - 1964-12-10], letter, December 10, 1964; (https://texashistory.unt.edu/ark:/67531/metapth250726/m1/1/: accessed May 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .