Former Pennsylvania Governor Tom Ridge studies a chart depicting the origin of the Marcellus Shale formation while touring outcroppings near Williamsport, Pa. on Thursday, June 16, 2011. (AP ... more 
Former Pennsylvania Governor Tom Ridge studies a chart depicting the origin of the Marcellus Shale formation while touring outcroppings near Williamsport, Pa. on Thursday, June 16, 2011. (AP Photo/Ralph Wilson) less 
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Associated Press | Photo By Ralph Wilson
Mon, Jun 27, 2011 2:53 AM EDT