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Geological surveys / Economic geology / Coal mining / Marcellus Formation / Middle Devonian / Utica Shale / United States Geological Survey / Shale gas / Geologic map / Geographic information system / Coal / West Virginia


2015 ANNUAL REPORT Cover Photos Top: Williamsport Sandstone near Alvon, West Virginia
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Document Date: 2016-02-02 11:09:29

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File Size: 2,05 MB

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