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21. Administrative Boundaries of National Park System Units, 2011

2011. United States. Bureau of Transportation Statistics. This polygon shapefile depicts service wide boundary set for display and general analysis purposes. This layer is part of the 2014 National Transpo... United States. Bureau of Transportation Statistics.

22. Administrative County Boundaries: United States and Territories, 2011

2011. United States. Bureau of the Census. Geography Division and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States administrative county boundaries extracted from the U.S. Census Bureau's MAF/TIGER Database (MTDB). T... United States. Bureau of Transportation Statistics.

23. Alabama Block Groups 2002

2002. Geographic Data Technology, Inc. (GDT). Alabama Block Groups represents the U.S. Census block groups of Alabama. Environmental Systems Research Institute, Inc. (ESRI).

24. Alabama Tracts 2002

2002. Geographic Data Technology, Inc. (GDT). Alabama Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Alabama. Environmental Systems Research Institute, Inc. (ESRI).

25. Alaska Block Groups 2002

2002. Geographic Data Technology, Inc. (GDT). Alaska Block Groups represents the U.S. Census block groups of Alaska. Environmental Systems Research Institute, Inc. (ESRI).

26. Alaska Tracts 2002

2002. Geographic Data Technology, Inc. (GDT). Alaska Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Alaska. Environmental Systems Research Institute, Inc. (ESRI).

27. Arizona Block Groups 2002

2002. Geographic Data Technology, Inc. (GDT). Arizona Block Groups represents the U.S. Census block groups of Arizona. Environmental Systems Research Institute, Inc. (ESRI).

28. Arizona Tracts 2002

2002. Geographic Data Technology, Inc. (GDT). Arizona Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Arizona. Environmental Systems Research Institute, Inc. (ESRI).

29. Arkansas Block Groups 2002

2002. Geographic Data Technology, Inc. (GDT). Arkansas Block Groups represents the U.S. Census block groups of Arkansas. Environmental Systems Research Institute, Inc. (ESRI).

30. Arkansas Tracts 2002

2002. Geographic Data Technology, Inc. (GDT). Arkansas Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Arkansas. Environmental Systems Research Institute, Inc. (ESRI).