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.
1. Chesapeake Energy is leasing land for shale drilling in Columbiana County.
The Oklahoma-based energy giant will lease property from the Columbiana County Port Authority.
2, A Penn State University researcher reports that drilling pads in Pennsylvania's Marcellus shale may be prone to erosion problems.
Researcher Patricl Brohan said he has no evidence of problems but such problems coiuld occur and a close eye should be kep on such pads where wells are located.