Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
Denver-based Antero Resources on Monday announced it had entered into an agreementr to sell off its assets in the Arkoma Basin to Vanguard Natural Resources LLC for $445 million.
The assets being sold include 66,000 net acres in the Woodford shale and 5,300 net acres in the Fayetteville shale in the Arkoma Basin of Oklahoma and Arkansas.
Antero has 134 producing wells in the Woodford shale.
The sale will allow Antero to focus on the liquids-rich Utica and Marcellus shales in Ohio and surrounding states, said Antero Resources chairman and CEO Paul M. Rady in a company-issued statement.