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 U.S. Environmental Protection Agency on Thursday reported that the water in 11 wells in Dimock, Pa., is safe.
The new tests begun earlier this year found sodium, methane, chromium and bacteria but at levels "within the safe range," the agency said.
Two wells had elevated levels of arsenic and the EPA will test those wells again.
The news disappointed local residents and health-environmental groups who want the federal government to intervene in the dispute with Cabot Oil & Gas Corp.
The residents have been fighting over water quality for several years since drilling into the Marcellus shale got under way.
The company said it was pleased that the water in the village in northeast Pennsylvania was deemed safe by the EPA.
Resident Craig Sautner was unhappy with the decision. "If they say it's safe, I want them to come drink water from my well," he told Business Week magazine.
You can read the story here.