Herrera, John J. [Letter from John J. Herrera to Frank M. Pinedo - 1957-04-17], letter, April 17, 1957; (https://texashistory.unt.edu/ark:/67531/metapth249317/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .