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.
Tom Stewart, the vice president and executive director of the Ohio Oil and Gas Association, says the industry is under scrutiny.
Speaking at a Columbus Business First event this week, Stewart said, "It's starting to get ugly," speaking of opposition to fracking in Ohio.
"Our industry is very concerned that we need to communicate with Ohioans, (public) policy people and the media," he said.
Stewart added, "This is big-time oil and gas. There will be rubs with society. We're starting to see that."
That includes the impacts of drilling on roads, local water supplies and neighbors with noise and traffic, he said.
He said public fears about hydraulic fracturing or fracking (using water, sand and certain chemicals under pressure to free up more natural gas deep underground) could, along with adverse tax policies and government regulations, cause gas-0il companies to scale back their investments in Ohio.
He said he suspected that the Youngstown injection well caused some seismic activity, speaking about the 11 earthquakes since March in the Youngstown area.
But the quakes were connected to disposal injection wells, not production wells that rely on fracking, he said.
You can read the Columbus Business First story by Jeff Bell here.