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11. Bailey's Ecoregions and Subregions of the United States, 2004

2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.

12. Coal Fields of the United States

2001. Eastern Energy Resource Surveys Team (Geological Survey). This polygon shapefile shows the coal fields of Alaska and the conterminous United States. Most of the material for the conterminous United States ... National Atlas of the United States.

13. Connecticut Block Groups 2002

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

14. Connecticut Tracts 2002

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

15. Connecticut ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). Connecticut ZIP Code Areas represents five-digit ZIP Code areas used by the U.S. Postal Service to deliver mail more effectively. The first digit ... Environmental Systems Research Institute, Inc. (ESRI).

16. Costly Regional Landslide Events in the United States

2001. Godt, Jonathan W. This polygon shapefile contains information on costly regional landslide events in the 50 United States and Puerto Rico. The extents of the regiona... National Atlas of the United States.

17. County Boundaries of the United States, 1980

1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

18. County Boundaries of the United States, 1990

1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

19. County Boundaries of the United States, 2000

2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

20. Current Distributions of Selected Amphibians in the United States, 1941-2000

1941. Lannoo, Michael J., Blackburn, Laura, and Nanjappa, Priya. This polygon shapefile portrays the distribution of 10 selected amphibians in the United States, based on historical literature and museum records ... National Atlas of the United States.