Salas, Mario Marcel. [Letter from Mario Marcel Salas to Mr. Moreno - July 12, 1978], letter, July 12, 1978; (https://texashistory.unt.edu/ark:/67531/metapth290877/m1/1/: accessed June 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .