2005. EROS Data Center. The grayscale North America shaded relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with... National Atlas of the United States.
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2011. National Atlas of the United States. This polygon shapefile portrays the hazardous waste generated, shipped, and received by state and other areas within the United States, Puerto Rico... National Atlas of the United States.
1981. United States. Soil Conservation Service. Shows land use.; "September 1981."; Includes vicinity map. 83 x 61 centimeters. The Service (Boise, Idaho.?).
1981. United States. Soil Conservation Service. Shows land use.; "September 1981."; Includes vicinity map. 83 x 61 centimeters. The Service (Boise, Idaho.?).
1914. Geological Survey (U.S.). Text and ill. on verso. 37 x 31 centimeters Scale approximately 1:380,160; 1 inch = 6 miles General Map Collection. U.S. Geological Survey (Washington).
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.
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.
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.
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.
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.
