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Author
- United States Geological Survey46
- Environmental Systems Research Institute (Redlands, Calif.)10
- Esri10
- Economic and Social Research Institute (Reston, Va.)9
- International Association of Seismology and Physics of the Earth's Interior2
- International Heat Flow Commission2
- Oklahoma State University. Department of Geography. Cartography Service2
- Circuit Rider Productions1
- Geological Survey (U.S.)1
- U.S. Geological Survey1