Version history for


  Stone, Paul, 2006, Database for the east half of 
       "Preliminary Geologic Map of the Blythe 30' by 60' 
       quadrangle, California and Arizona" (U.S. Geological 
       Survey Open-File Report 90-497):  U.S. Geological 
       Survey Data Series 225 [available on the World Wide 
       Web at http://pubs.usgs.gov/ds/2006/225/ ].



  Version 1.0


  November 29, 2006

  Initial release online at
  http://pubs.usgs.gov/ds/2006/225/


  The original geologic map for this database was published 
  1n 1990 as U.S. Geological Survey Open-File Report 90-497 
  and is available from the USGS in the form of paper 
  copies reproduced from a scale-stable film original.  The 
  scale of the previously published map is 1:100,000.