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U.S Government, provider of Global Positioning System. |
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Peter H. Dana, The Geographer's Craft Project, Department of Geography, The University of Colorado at Boulder. |
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Halifax RASC |
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Natural Resources Canada |
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GPS Receiver manufacturer |
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GPS Receiver manufacturer |
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GPS Receiver manufacturer |
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GPSReceiver/Mobile Phone manufacturer |
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GPS user Journal |
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A source of GPS information materials |
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A GPS Information Resource |
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