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.
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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.
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.
1971. Bounding Box (W,S,E,N): -93.9791,44.4981,-92.8021,45.361 Ecological Study for the Twin Cities Metropolitan Area.
Bounding Box (W,S,E,N): -93.9791,44.4981,-92.8021,45.361 Ecological Study for the Twin Cities Metropolitan Area.
1968. Map of Major River - Water Quantity prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. S... Wallace, McHarg, Roberts and Todd.
227. Major Rivers - Water Quality - Biological: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Major Rivers - Water Quality - Biological prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropo... Wallace, McHarg, Roberts and Todd.
228. Major Rivers - Water Quality - Chemical: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Major Rivers - Water Quality - Chemical prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropoli... Wallace, McHarg, Roberts and Todd.
1999. Geological Survey (U.S.). This line shapefile portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the i... Geological Survey (U.S.).
1920. O'Hara and Zeese Civil engineers and Surveyors and Zeese, Paul. Cartographic Details: Scale approximately 1:150,000 (W 93°49'--W 93°02'/N 47°02'--N 46°08'). 79 x 47 centimeters Scale approximately 1:150,000 Minn... O'Hara & Zeese Civil Engineers and Surveyors (Aitkin, Minnesota; The Dept. (Minnesota).