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- Esri20
- TomTom North America, Inc.9
- U.S. Department of Commerce, Census Bureau7
- Michael Bauer Research GmbH4
- Garmin International, Inc.2
- National Atlas of the United States and the United States Geological Survey1
- U.S. Census Bureau, Geography Division1
- U.S. Department of Commerce, Census Bureau, Geography Division1
- United States Geological Survey1