[Postcard of the Palo Duro Canyon], postcard, 19XX; (https://texashistory.unt.edu/ark:/67531/metadc1781588/m1/1/: accessed May 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Postcard of the Palo Duro Canyon], postcard, 19XX; (https://texashistory.unt.edu/ark:/67531/metadc1781588/m1/1/: accessed May 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .