Herrera, John J. [Letter from John J. Herrera to V. V. Ramsey - 1961-05-23], letter, May 23, 1961; (https://texashistory.unt.edu/ark:/67531/metapth249695/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .