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Author
- Kelso, Nathaniel Vaughn39
- Patterson, Tom39
- Environmental Systems Research Institute (Redlands, Calif.)8
- United States. Department of State. Office of the Geographer8
- Michael Bauer Research GmbH4
- Geological Survey (U.S.)3
- Canada Centre for Remote Sensing2
- DeLorme Publishing Company2
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)2
- National Geographic Society (U.S.)1