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.
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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.
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.
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.
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.).
1996. Environmental Systems Research Institute (Redlands, Calif.). Manufacturing Centers, 1996 is a point theme representing major manufacturing centers worldwide. Attribute information includes the name of the ce... ESRI.
1927. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing known mineral resources worldwide as of 1927. The locations and attributes of all points were taken from a two-part Weltlage...
1947. Schultz, Kenneth A. This polygon shapefile represents areas that were the subject of interstate territorial disputes between 1947 and 2000. The disputed areas referenc... Stanford Digital Repository.
2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line census metropolitan divisions for the United States. The TIGER/Line Files are shapefiles and...