Version history for:


  Singer, Donald A., Berger, Vladimir I., and Moring, 
       Barry C., 2005, Porphyry copper deposits of the 
       world:  database, map, and grade and tonnage models:  
       U.S. Geological Survey Open-File Report 2005-1060. 
       [available on the World Wide Web at 
       http://pubs.usgs.gov/of/2005/1060/ ]


  Version 1.0, February 14, 2005

  Initial release online at
  http://pubs.usgs.gov/of/2005/1060/