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Author
- United States Geological Survey47
- CHGIS, Harvard Yenching Institute9
- Arizona. State Land Department2
- ESRI2
- Environmental Systems Research Institute (Redlands, Calif.)2
- National Atlas of the United States and the United States Geological Survey2
- Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey2
- Earth Satellite Corporation1
- Economic and Social Research Institute1