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Publisher
- United States. Bureau of Transportation Statistics3
- Environmental Systems Research Institute (Redlands, Calif.)2
- National Atlas of the United States2
- TTG, Inc.2
- United States. Bureau of the Census. Geography Division2
- University of Arizona. Cooperative Extension2
- Esri1
- Hart Energy Publishing1
- National Marine Protected Areas Center (U.S.)1
- Northeast Regional Ocean Council1
- United States. Department of State. Humanitarian Information Unit1