Version history for


  Gardner, Cynthia A., and Guffanti, Marianne C., 2006, 
       U.S. Geological Survey's alert notification system 
       for volcanic activity:  U.S. Geological Survey Fact 
       Sheet 2006-3139 [available on the World Wide Web at 
       http://pubs.usgs.gov/fs/2006/3139/ ].


  Version 1.0, March 2, 2007

  Initial release online at
  http://pubs.usgs.gov/fs/2006/3139/