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.
Vehilces powered by natural gas will be a key topic on Oct. 9 when Ohio holds its statewide energy summit.
The day-long conference will be held at the Student Union at Ohio State University in Columbus.
The event is being organized and sponsored by the Public Utilities Commission of Ohio and America's Natural Gas Alliance. It is open to the public.
More than 1,000 people last year attended Gov. John Kasich's energy summit.