[Letter from Mario Marcel Salas to Center Atkins], letter, 1978~; (https://texashistory.unt.edu/ark:/67531/metapth290855/m1/1/: accessed June 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Letter from Mario Marcel Salas to Center Atkins], letter, 1978~; (https://texashistory.unt.edu/ark:/67531/metapth290855/m1/1/: accessed June 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .