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 reports: "Chesapeake Energy Corp. Chief Executive Officer Aubrey McClendon will resign from the company he built into the second-largest U.S. natural gas producer after scrutiny of his personal finances and a corporate cash crunch erased as much as 43 percent of its market value last year.
"McClendon will retire from the company April 1 and will serve as CEO until his successor is appointed, Oklahoma City- based Chesapeake said today in a statement. "The board said to date it has found no evidence of improper conduct in the CEO’s relationship with the company. It will release its review on Feb. 21, when announcing earnings results."