Revision History for USGS
  Scientific Investigations Report 2010-5090-A

  Jane M. Hammarstrom, Gilpin R. Robinson, Jr., 
  Steve Ludington, Floyd Gray, Benjamin J. Drenth, 
  Francisco Cendejas-Cruz, Enrique Espinosa, 
  Efren Perez-Segura, Martin Valencia-Moreno, 
  Jose Luis Rodriguez-Castaneda, Rigoberto Vasquez-Mendoza, 
  and Lukas Zurcher

  Porphyry Copper Assessment of Mexico

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  Made minor edits to text
  November 1, 2010
  October 27, 2010

  Replaced GIS package with improved version
  October 7, 2010

  Posted online at http://pubs.usgs.gov/sir/2010/5090/a/
  September 29, 2010

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