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Surveying
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United States
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1. U.S. State Plane Zones (NAD 1983)
1997. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the State Plane Coordinate System (SPCS) Zones for the 1983 North American Datum within United States. Several St... Environmental Systems Research Institute (Redlands, Calif.).
2. U.S. State Plane Zones (NAD27)
1987. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the State Plane Coordinate System (SPCS) zones for the 1927 North American Datum within United States. Several St... Environmental Systems Research Institute (Redlands, Calif.).