| http://www.w3.org/ns/prov#value | - Compounding the problem, experts and legislators say, is a lack of understanding over how shale drilling operations could affect land already perforated with holes from private water wells, coal mining, and shallow oil and gas drilling.In Pennsylvania, we have a lot of pre-existing conditions, said John Stolz, director of the Center for Environmental Research and Education at Duquesne University
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