"San Antonio-El Paso Mail". The Handbook of Texas Online. For more on the establishment of this route, see United States Army, Corps of Topographical Engineers; Eggleston Johnston, Joseph; Bryan, Francis T.; Marcy, Randolph Barnes; Smith, William F.; Michler, N. H.; French, S. G.; Whiting, W. H. C.; Simpson, James H. (1850). Reports of the Secretary of War: with Reconnaissances of Routes from San Antonio to El Paso. Washington, DC: Union Office. Retrieved May 22, 2009.
"San Antonio-El Paso Mail". The Handbook of Texas Online. For more on the establishment of this route, see United States Army, Corps of Topographical Engineers; Eggleston Johnston, Joseph; Bryan, Francis T.; Marcy, Randolph Barnes; Smith, William F.; Michler, N. H.; French, S. G.; Whiting, W. H. C.; Simpson, James H. (1850). Reports of the Secretary of War: with Reconnaissances of Routes from San Antonio to El Paso. Washington, DC: Union Office. Retrieved May 22, 2009.