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From the site: "A reference map of the total intensity magnetic field of the earth in gammas published by the WV Geological and Economic Survey in 1978. In May/June 2007, two...
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View within SubmissionGathering Resources...NGDC's Vision is to be the world's leading provider of geophysical and environmental data, information, and products. The National Geophysical Data Center (NGDC), located in...-
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View within SubmissionGathering Resources...From the site: “The Geologic Atlas of the United States is a set of 227 folios published by the U.S. Geological Survey between 1894 and 1945. Each folio includes both...-
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View within SubmissionGathering Resources... -