Geological Map of the United States and Part of Canada Compiled by C. H. Hitchcock for the American Institute of Mining Engineers to Illustrate the Schemes of Coloration and Nomenclature Recommended by the International Geological Congress **the first ge
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Geological Map of the United States and Part of Canada Compiled by C. H. Hitchcock for the American Institute of Mining Engineers to Illustrate the Schemes of Coloration and Nomenclature Recommended by the International Geological Congress **the first ge
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