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- United States. Department of Housing and Urban Development55
- United States. Bureau of Transportation Statistics30
- National Atlas of the United States26
- Geological Survey (U.S.)16
- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)16
- North American Cartographic Information Society8
- Bureau of Transportation Statistics (BTS)7
- U.S. Census Bureau7
- Environmental Systems Research Institute (Redlands, Calif.)5
- U.S. Bureau of the Census5
- Gap Analysis Program (U.S.)3
- University of California, Berkeley. Museum of Vertebrate Zoology3
- Bureau of Transportation Statistics2
- National Marine Protected Areas Center (U.S.)2
- Research and Innovative Technology Administration's Bureau of Transportation Statistics2
- Canada Centre for Mapping1
- Esri1
- National Energy Information Center (U.S.)1
- Snohomish County (WA) Geographic Information System (Snohomish GIS)1
- Stanford Digital Repository1