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.
Bloomberg News on Tueday reported that billionaire investor T. Boone Pickens sold his remaining shares in Chesapeake Energy Corp. during the second quarter.
Pickens said in May that his Capital Management LP fund was existing its stake in the financially troubled Okalohoma-based natural gas producer.
The fund sold its 499,055 Chesapeake shares beftween April 1 and June 30, according to a regulatory filing.