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Author
- United States Geological Survey18
- Economic and Social Research Institute (Reston, Va.)13
- Tele Atlas North America, Inc.9
- ESRI8
- National Atlas of the United States and the United States Geological Survey4
- Environmental Systems Research Institute (Redlands, Calif.)2
- Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey2
- Economic and Social Research Institute1
- Health Forum, L.L.C.1
- Tele Atlas (Firm : U.S.)1
- Tele Atlas B.V.1