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Author
- United States Geological Survey18
- Economic and Social Research Institute (Reston, Va.)9
- Environmental Systems Research Institute (Redlands, Calif.)8
- East View Cartographic, Inc.2
- United States. Defense Mapping Agency2
- Digital Social Science Center (DSSC), Columbia University Libraries1
- Esri1
- ML InfoMap (Firm)1
- United States. Central Intelligence Agency1