Alpine, The Last Frontier Land, paper, December 13, 1971; (https://texashistory.unt.edu/ark:/67531/metapth88024/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Alpine, The Last Frontier Land, paper, December 13, 1971; (https://texashistory.unt.edu/ark:/67531/metapth88024/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .