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- National Atlas of the United States99
- Geological Survey (U.S.)32
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- Platts9
- U.S. Geological Survey3
- American Association of Petroleum Geologists,1
- Canada Centre for Mapping1
- Gap Analysis Program (U.S.)1
- National Geospatial Program, The National Map Small Scale1
- National Park Service1
- United States. Bureau of Transportation Statistics1