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Geographic information system

24 bytes added, 20:19, 8 January 2010
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* [http://www.oreillynet.com/wireless/2000/12/29/two_gps.html The difficulties of a poor man's differential GPS]
* [http://code.google.com/p/googletransitdatafeed/wiki/PublicFeeds Public Google Transit Feeds]
 
[[Category:Reference]]
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