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41. Major Dams: United States and Territories, 2006

2006. Rawson, Peg. This point shapefile depicts major dams in the United States, including Puerto Rico and the U.S. Virgin Islands. The map layer was created by extra... United States. Bureau of Transportation Statistics.

42. Topographic and Bathymetric Shaded Relief of North America

2005. National Atlas of the United States. The Topographic and Bathymetric Shaded Relief of North America map layer shows depth and elevation ranges using colors, with relief enhanced by sha... National Atlas of the United States.

43. United States Labor Statistics 2005-2009

2005. National Atlas of the United States. This data set portrays labor statistics annual averages for the years 2005 to 2009, shown by county, for the United States and Puerto Rico. The da... National Atlas of the United States.

44. 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.

45. National Fire Plan - Hazardous Fuels Reduction Program, 2004

2004. National Atlas of the United States. This polygon shapefile portrays county level data for the fiscal-year-2004 National Fire Plan - Hazardous Fuels Reduction Program. The purpose of t... National Atlas of the United States.

46. North American Atlas - Bathymetry (Polygons)

2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Canada Centre for Mapping, and Geological Survey (U.S.). This polygon shapefile contains bathymetric data with depth in metres for ocean areas covered by the extent of the North American Atlas project. Is... Canada Centre for Mapping.

47. United States Income and Employment 2004-2008

2004. National Atlas of the United States. This map layer portrays 2004-2008 per capita personal income, annual number of full-time and part-time jobs, average wage per job in dollars, popul... National Atlas of the United States.

48. Volcanoes: United States, 2004

2004. National Atlas of the United States. This point shapefile includes Holocene volcanoes, which are those thought to be active in the last 10,000 years, that are within an extended area o... National Atlas of the United States.

49. Construction Minerals Operations

2003. Geological Survey (U.S.) Minerals Information Team. This point shapefile represents construction minerals operations in the United States. The data represent commodities covered by the Minerals Infor... National Atlas of the United States.

50. Ferrous Metal Mines

2003. Geological Survey (U.S.) Minerals Information Team. This point shapefile includes ferrous metal mines in the United States. The data represent commodities covered by the Minerals Information Team (MI... National Atlas of the United States.