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.
From the Marcellus Drilling News and the Warren Tribune Chronicle:
BP has released about 180 Trumbull County landowners with 4,203 acres from leases because of legal issues and problems associated with mineral rights.
The landowners were among those who leased 84,000 acres last March to BP.
It agreed to pay a signing bonus of $3,900 per acre plus royalties of 17.5 percent.
The landowners with problem leases have been abandoned since November.