The American Flag. (Matamoros, Tamaulipas, Mexico), Vol. 1, No. 18, Ed. 1 Friday, July 31, 1846, newspaper, July 31, 1846; (https://texashistory.unt.edu/ark:/67531/metapth478637/m1/5/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .