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* http://docs.lib.duke.edu/maps/guides/gis.html | * http://docs.lib.duke.edu/maps/guides/gis.html | ||
* http://www.mapcruzin.com/download_mapcruz.htm | * http://www.mapcruzin.com/download_mapcruz.htm | ||
* http://www.geographynetwork.com/freeresources.html | * http://www.geographynetwork.com/freeresources.html | ||
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