Rio Grande Herald (Rio Grande City, Tex.), Vol. 33, No. 29, Ed. 1 Thursday, May 1, 1975, newspaper, May 1, 1975; (https://texashistory.unt.edu/ark:/67531/metapth194507/m1/1/: accessed April 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .