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.
Billionaire energy investor T. Boone Pickens said he has sold off his shares in Chesapeake Energy Corp., his third-biggest stock holding on Dec. 31.
"We do not own Chesapeake stock," Pickens said Thursday at a Las Vegas conference. "We didn't like natural gas."
He denied that the sale of his stock was tied to the financial dealings of of Chesapeake head Aubrey McClendon, Pickens told Bloomberg News.
It reported that Pickens owned 570,055 shares of Chesapeake as of Dec. 31.