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61. Magnetic Field - Secular Variation of the Horizontal Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the horizontal component of the total field intensity of the Earth's ... National Atlas of the United States.

62. Magnetic Field - Secular Variation of the Inclination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This shapefile shows lines of equal annual change (secular variation) in the inclination of the Earth's magnetic field, derived from the Internatio... National Atlas of the United States.

63. Magnetic Field - Secular Variation of the Total Field Component for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation), in the total field intensity of the Earth's magnetic field, derived fro... National Atlas of the United States.

64. Magnetic Field - Secular Variation of the Vertical Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the vertical component of the total field intensity of the Earth's ma... National Atlas of the United States.

65. Magnetic Field - Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.

66. Magnetic Field - Vertical Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.

67. Miscellaneous Industrial Minerals Operations

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

68. 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.

69. 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.

70. Nonferrous Metal Mines

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

71. Nonferrous Metal Processing Plants

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

72. 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.

73. Ports of the United States, 2014

2014. National Atlas of the United States. This map layer shows major ports in the United States, Puerto Rico, and the U.S. Virgin Islands. A port is a city, town, or urban area with a harbo... National Atlas of the United States.

74. Quaternary Fault and Fold Database of the United States (Lines)

2005. Geological Survey (U.S.). This map layer contains locations and information on faults and associated folds, in the United States, that are believed to be sources of signific... National Atlas of the United States.

75. Quaternary Fault and Fold Database of the United States (Polygons)

2005. Geological Survey (U.S.). This map layer contains locations and information on faults and associated folds, in the United States, that are believed to be sources of signific... National Atlas of the United States.

76. Railroad and Bus Passenger Stations of the United States, 2012

2012. National Atlas of the United States. This point shapefile shows Amtrak intercity railroad and bus passenger terminals in the United States. There are no Amtrak stations in Alaska or Ha... National Atlas of the United States.

77. Refractory, Abrasive, and Other Industrial Minerals Operations

2003. Geological Survey (U.S.) Minerals Information Team. This point shapefile represents the locations of refractory, abrasive, and other industrial minerals operations in the United States. The data repr... National Atlas of the United States.

78. Sand and Gravel Operations in the United States

2002. Geological Survey (U.S.) Minerals Information Team. This point shapefile includes sand and gravel operations in the United States. These data were obtained from information reported voluntarily to th... National Atlas of the United States.

79. Satellite View of the Conterminous United States, with Shaded Relief

1987. National Atlas of the United States. The Satellite View of the Conterminous United States, with Shaded Relief map layer is a 200-meter-resolution simulated-natural-color image of the U... National Atlas of the United States.

80. Seismic Hazard Map for the United States

2012. Rukstales, Kenneth S. (compiler). This polygon shapefile represents seismic hazards in the United States. The data represent a model showing the probability that ground motion will ... National Atlas of the United States.