Walter H. Horne. [Army Field Ambulance], Postcard, 1910-1920; digital images, (http://texashistory.unt.edu/ark:/67531/metapth187743/ : accessed May 18, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting El Paso Public Library , El Paso, Texas.
