Opperman, Joe & Yancey, Michael D. [A.G. Kraege, (Oblique)], photograph, December 15, 1975; (https://texashistory.unt.edu/ark:/67531/metapth687838/m1/1/: accessed January 22, 2020), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .