Version history for


  Mest, Scott C., and Crown, David A., 2006, Geologic map 
       of the MTM -20272 and -25272 quadrangles, Tyrrhena 
       Terra region of Mars:  U.S. Geological Survey 
       Scientific Investigations Map 2934 
       [http://pubs.usgs.gov/sim/2006/2934/].


  Version 1.0, March 27, 2007

  Initial release online at
  http://pubs.usgs.gov/sim/2006/2934/