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- Hart Energy Publishing54
- National Atlas of the United States20
- Environmental Systems Research Institute (Redlands, Calif.)18
- United States. Bureau of Transportation Statistics17
- TTG, Inc.16
- United States. Department of Housing and Urban Development11
- National Energy Information Center (U.S.)10
- Geological Survey (U.S.)5
- Hart Energy3
- International Heat Flow Commission1
- North American Cartographic Information Society1
- Stanford Digital Repository1
- United Nations. Office for Disaster Risk Reduction1