Rio Grande Herald (Rio Grande City, Tex.), Vol. 21, No. 24, Ed. 1 Thursday, June 15, 1972, newspaper, June 15, 1972; (https://texashistory.unt.edu/ark:/67531/metapth194359/m1/1/: accessed April 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .