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.
The Business Journal reported on Friday that BP Energy is likely to drill its first well in Trumbull County in 2013.
Site preparation could begin late this year, company officials said.
No site was mentioned for the first well, said spokesman Bruce Abbuhl.
He also said the company is still seeking to add to its leased acreage in Trumbull County and elsewhere in eastern Ohio.
The company has signed 2,000 leases totalling 85,000 acres in a deal valued at $331 million in bonus payments.