Crotalus atrox (western diamondback rattlesnake), 1859. Lithograph, 9 x 61/2 in.
(image) From William H. Emory, Report on the United States and Mexican Boundary
Survey (2 vols.; Washington, 1857-1859). Courtesy Eugene C. Barker Texas
History Center, University of Texas, Austin.
Texas State Historical Association. The Southwestern Historical Quarterly, Volume 90, July 1986 - April, 1987. Austin, Texas. The Portal to Texas History. http://texashistory.unt.edu/ark:/67531/metapth117152/. Accessed July 30, 2015.