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Coal Classifier In Usa North America

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Usgs open-file report of 96-92 coal fields of the conterminous united states. digitally compiled by john tully. introduction quotcoal fields of the conterminous united statesquot is a digital representation of james trumbulls quotcoal fields of the united statesquot sheet 1, 1960, which is an adaptation of previous maps by averitt 1942 and campbell1908.

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