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41. 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.

42. National Wilderness Preservation System of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.

43. North America (Natural Gas Holding Company Service Territories, 2008)

Platts. The Platts Natural Gas Holding Company Service Territories geospatial data layer contains regions representing the geographic extent of retail serv... Platts.

44. North America (Natural Gas Utility Service Territories, 2008)

Platts. The Platts Natural Gas Utility Service Territories geospatial data layer contains regions representing the geographic extent of retail service prov... Platts.

45. North America (Non-Regulated Electric Service Provider Territories, 2008)

Platts. The Platts Non-Regulated Electric Service Provider Territories contains regions representing the geographic extent of retail service offered by com... Platts.

46. North America (Non-Regulated Natural Gas Service Provider Territories, 2008)

Platts. The Platts Non-Regulated Natural Gas Service Provider Territories contains regions representing the geographic extent of retail service offered by ... Platts.

47. 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.

48. Omernik's Level III Ecoregions of the Continental United States, 2003

2003. United States. Environmental Protection Agency. This polygon shapefile shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of... National Atlas of the United States.

49. Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands

2003. Geological Survey (U.S.). Water Resources Division. Wisconsin District. This polygon shapefile contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islan... Geological Survey (U.S.).

50. Public Land Survey System of the United States, 2010

2010. Geological Survey (U.S.). This polygon shapefile portrays the Public Land Surveys of the United States, including areas of private survey, donation land claims, and land gra... Geological Survey (U.S.).