[McDonald Observatory], photograph, May 1978; (https://texashistory.unt.edu/ark:/67531/metapth663764/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[McDonald Observatory], photograph, May 1978; (https://texashistory.unt.edu/ark:/67531/metapth663764/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .