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DePriest, Dale.  “How Your GPS Works.”  Global Positioning System.  November 2002. 

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Dana, Peter H.  “Global Positioning Overview.”  The Global Positioning System.  May 2000.  The Geographer’s Craft.  2 May 2005 <http://www.colorado.edu/ geography/ gcraft/notes/gps/gps_f.html>.

“The Global Positioning System: The Role of Atomic Clocks.”  Beyond Discovery: The Path from Research to Human Benefit.  December 2003.  The National Academy of Sciences.  27 April 2005 <http://www.beyonddiscovery.org/content/

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Shane, Jeffery H.  “A New policy for GPS.”  GPS World 1 March 2005. 

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