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Terry Engelder, a world-renowned geoscientist who first predicted there were vast amounts of accessible natural gas within the Marcellus Shale, sparking a natural gas boom in the region, is retiring from a decadeslong career at Penn State. | by pennstatenews
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Terry Engelder, a world-renowned geoscientist who first predicted there were vast amounts of accessible natural gas within the Marcellus Shale, sparking a natural gas boom in the region, is retiring from a decadeslong career at Penn State.

Photo by John Beale 2011

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Taken on May 4, 2011