Regarding Spanish Colonial horse, mule, and ox shoes, see Chapter 6,
"Farriery," in the following:
 
Simmons, Marc, and Frank Turley
  1980  Southwestern Colonial Ironwork:  The Spanish Blacksmithing
        Tradition from Texas to California.  Santa Fe:  Museum of New Mexico
        Press.
 
 
Mike Jacobs
Arizona State Museum
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