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.
U.S. Environmental Protection Agency Administrator Lisa Jackson on Wednesday told energy industry leaders and environmentalists that hydraulic fracturing or fracking can be done without harmful impacts.
Speaking at a conference in New Jersey, Jackson said, "I think that fracking as a technology is perfectly capable of being clean."
Her comments at the Richard Stockton College energy conference were among the strongest from Jackson in support of fracking.
She added the the drilling for natural gas presents "an historic opportunity" for energy development and job creation, the Asbury park Press reported.
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