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 natural gas industry needs to do more to reduce the on-the-ground impacts of drilling, a top Chesapeake Energy official says.
Scott Rotruck, a Chesapeake Energy vice president, said, "With natural gas, everybody likes the blue flame. Making it can be problematic. Nobody likes that part.
"I can tell you this: The sausage-making will get better and better and better," he said in a story by Ken Ward Jr. of the Charleston Gazette.
"It's no longer wildcatting," Rotruck said. "It's perfecting the technique and the methods and the execution."
He was speaking last week at a conference organized by the West Virginia Manufacturers Association.
Chesapeake Energy is the No. 1 player in Ohio's Utica shale.