Physisch-Politische Karte von Nord-America., map, 1846; (https://texashistory.unt.edu/ark:/67531/metapth193408/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Physisch-Politische Karte von Nord-America., map, 1846; (https://texashistory.unt.edu/ark:/67531/metapth193408/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .