Map of the Mississippi River from its source to the mouth of the Missouri laid down from the notes of Lieutt. Z. M. Pike by Anthony Nau., map, 1810; (https://texashistory.unt.edu/ark:/67531/metapth192782/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .