Suggested citation and version history for:


  Dartnell, Peter, and Gibbons, Helen, 2009, Sea Floor off 
       San Diego, California [postcard]:  U.S. Geological 
       Survey General Information Product 87 
       [http://pubs.usgs.gov/gip/87/].


  June 3, 2009
  Initial release online at
  http://pubs.usgs.gov/gip/87/