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 Pennsylvania-based Marcellus Shale Coalition reported this week that Marcellus shale wells in Beaver County next to the Ohio line have not been overly productive.
But deeper Utica shale wells in Beaver County have been "very productive," said Kathryn Klaber, president of the Marcellus Shale Coalition, a pro-drilling group based in Canonsburg, Pa.
The Marcellus shale in eastern Ohio is very thin and not overly productive. That's why drillers are more interested on Ohio's Utica shale.