Herrera, John J. [Letter from John J. Herrera to Raul Perez - 1949-01-12], letter, January 12, 1949; (https://texashistory.unt.edu/ark:/67531/metapth249978/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .