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Postdoctoral scientist Stephen Osborn sampling well water at a private home in Pennsylvania
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Duke Professor Rob Jackson
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A close-up of a gas pad over the Marcellus Shale
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A gas pad in Susquehanna County, Pennsylvania
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A groundwater well in Pennsylvania's Susquehanna County
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Stephen Osborn and Nat Warner sampling groundwater in Bradford County
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A gas well with many frack tanks on site
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Duke grad student Nat Warner collects data from a private well before collecting a water sample
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One homeowner's opinion
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Nicholas School Professor Avner Vengosh and postdoctoral scientist Stephen Osborn sampling water
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A view from the front porch of a house where the researchers took samples