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 Washington Post reports that Virginia's Rockingham County has, in effect, rejected the first drilling request into the Marcellus shale.
Carrizzo Oil and Gas wanted to drill in the Blue Ridge Mountains near the West Virginia-Virginia border. It would have been the first well in Virginia to tap into the Marcellus shale.
But the county failed to act on the company's request for a needed special land-use permit. The county's five supervisors, concerned about the drilling, never acted on the permit request. The company shelved the project after two years of work.
Maryland has also halted Marcellus gas exploration in that stat until a study of impacts can be completed.