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31. 1:1,000,000-Scale Railroads, United States, 2012
2012. National Atlas of the United States. This line shapefile represents railroads in the conterminous United States and Alaska for 2012 at 1:1,000,000 scale. This layer is part of the 1997... National Atlas of the United States.
32. 1:1,000,000-Scale State Boundaries of the United States, 2012
2012. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.
33. Airports of the United States, 2012
2012. Geological Survey (U.S.). This point shapefile includes airports in the United States, Puerto Rico and the U.S. Virgin Islands. The data were derived from an extract of the ... Geological Survey (U.S.).
34. 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.
35. 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.
36. United States Populated Places, 2013
2011. United States. Bureau of Transportation Statistics. This data set includes cities in the United States, Puerto Rico and the U.S. Virgin Islands. These cities were collected from the 1970 National Atl... U.S. Geological Survey.
37. Magnetic Field - Declination Component for the Epoch 2010.0
2010. National Geophysical Data Center. This map layer shows isogonic lines (lines of constant declination of the Earth's magnetic field), derived from the International Geomagnetic Refer... National Atlas of the United States.
38. Magnetic Field - Horizontal Component of the Total Field Intensity for the Epoch 2010.0
2010. National Geophysical Data Center. This line shapefile shows lines of equal horizontal intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference F... National Atlas of the United States.
39. Magnetic Field - Inclination Component for the Epoch 2010.0
2010. National Geophysical Data Center. This shapefile shows isoclinic lines (lines of constant inclination of the Earth's magnetic field), derived from the International Geomagnetic Refe... National Atlas of the United States.
40. Magnetic Field - Secular Variation of the Declination Component for the Epoch 2010.0
2010. National Geophysical Data Center. This map layer shows isoporic lines (lines of equal annual change, or secular variation, in the declination of the Earth's magnetic field), derived... National Atlas of the United States.