Penwell Quadrangle, map, 1981; (https://texashistory.unt.edu/ark:/67531/metapth459386/m1/1/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Penwell Quadrangle, map, 1981; (https://texashistory.unt.edu/ark:/67531/metapth459386/m1/1/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .