Suggested citation and version history for:  


  Hamill, John F., 2009, Grand Canyon Monitoring and 
       Research Center:  U.S. Geological Survey General 
       Information Product 85, 4 p. 
       [http://pubs.usgs.gov/gip/85/].


  Version 1.0, April 27, 2009

  Initial release online at
  http://pubs.usgs.gov/gip/85/