Rio Grande Herald (Rio Grande City, Tex.), Vol. 31, No. 22, Ed. 1 Thursday, June 28, 1973, newspaper, June 28, 1973; (https://texashistory.unt.edu/ark:/67531/metapth194413/m1/1/: accessed April 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .