1980. United States. Soil Conservation Service. Shows land use.; Accompanied by: Fact sheet.; Includes location map. 56 x 43 centimeters Scale 1:100,000. USDA-SCS (Portland, Or.).
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1980. United States. Soil Conservation Service. Shows land use.; June 1980.; Accompanied by: Fact sheet.; Includes location map. 122 x 102 centimeters Scale 1:100,000. 1 cm. to 1 km. The Service (Bozeman, Mont.?).
1926. Mulford, John C. Includes text.; Map no. 21806. 27 x 20 Centimeters Scale approximately 1:500,000 General Map Collection. Dept. of the Interior, Bureau of Reclamation (Washington, D.C).
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.
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.
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.