Suggested citation and version history for


  Lopez, Ivan, and Hansen, Vicki L., 2008, Geologic map 
       of the Helen Planitia quadrangle (V-52), Venus:  
       U.S. Geological Survey Scientific Investigations 
       Map 3026  [http://pubs.usgs.gov/sim/3026/].


  Version 1.0, January 14, 2009

  Initial release online at
  http://pubs.usgs.gov/sim/3026/