Continuously Operating Reference Stations (CORS) coverage in the United States as of October 2006.
Revised
December 12, 2006
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National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/visions/spatial_ref_system/cors_map.html
National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/visions/spatial_ref_system/cors_map.html