[Message from José María Echeagaray to Ildefonso Ramón, May 17, 1819], text, 1819-05~; (https://texashistory.unt.edu/ark:/67531/metapth869251/m1/1/: accessed June 3, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .