FILE – In this Oct. 14, 2011, file photo, a drilling rig is set up to tap gas from the Marcellus Shale gas field, near a barn in the Susquehanna County township of Springville, Pa. Natural gas producers drilled more than twice as many shale wells in the first half of 2017 compared to the same period last year. One big reason is that natural gas prices have recovered from 20-year lows, nearly doubling since last year. Three counties, Washington, Greene and Susquehanna, account for more than 60 percent of the wells drilled so far this year. (AP Photo/Alex Brandon, File)
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