Suggested citation and version history for:  


  Mastin, L.G., Guffanti, Marianne, Ewert, J.E., and 
       Spiegel, Jessica, 2009, Preliminary spreadsheet of 
       eruption source parameters for volcanoes of the 
       world:  U.S. Geological Survey Open-File Report 
       2009-1133, v. 1.2, 25 p. 
       [http://pubs.usgs.gov/of/2009/1133/].


  Version 1.2

  July 15, 2009
  Initial release online at
  http://pubs.usgs.gov/of/2009/1133/


  Versions 1.0 and 1.1
  Input from colleagues with expertise in each geographic 
  region, and as volcanic activity unfolded, prior to 
  release of this publication.