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Database of the Geologic Map of North America
"The Geological Society of America’s (GSA) Geologic Map of North America (Reed and others, 2005; 1:5,000,000) shows the geology of a significantly large area of the Earth,... -
USGS Mineral Resources: Magnetic anomaly maps and data for North America
From the site: "Airborne measurement of the earth's magnetic field over all of North America provides gridded data describing the magnetic anomaly caused by variations in earth... -
USGS Mineral Resources: Aeroradiometric Surveys of North America
From the site: "Data generated by aerial sensing of radiation emanating from the earth's surface provides general estimates of the geographic distribution of Uranium, Thorium,...
