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.
Last Friday, a second New York judge has upheld a town's ban on natural gas drilling.
The town of Middlefield's 2011 ban on gas drilling including hydraulic fracturing or fracking was upheld by State Supreme Court Judge Donald Cerio.
On Feb. 21, State Supreme Court Judge Phillip Rumsey had upheld the town of Dryden's ban on drilling. He was said was not preempted by state laws.
Officials in Middlefield are pleased that home rule was upheld, said town counsel David J. Clinton.
In 2010, New York imposed a moratorium on drilling into the Marcellus shale. The state is looking at lifting that moratorium, perhaps this summer.