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Geologic Atlas: Johnstown folio, Pennsylvania
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... -
GAFFEY METEORITE SPECTRA V2.0
Laboratory spectra of meteorite samples, obtained by M. J. Gaffey.