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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...From the site: "Ecoregions were originally designated by the U.S. Forest Service in 1978 to provide a general description of the ecosystem geography of the United States." May...-
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View within SubmissionGathering Resources...From the site: "A reference map of Bouguer gravity values with axes of persistent highs and lows published by the WV Geological and Economic Survey in 1987. In May/June 2007,...-
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View within SubmissionGathering Resources... -