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Author
- Economic and Social Research Institute (Reston, Va.)13
- United States Geological Survey9
- ESRI6
- Tele Atlas North America, Inc.5
- National Atlas of the United States and the United States Geological Survey3
- Economic and Social Research Institute1
- Environmental Systems Research Institute (Redlands, Calif.)1
- Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey1
- Tele Atlas (Firm : U.S.)1