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.
A Pennsylvania judge on Wednesday delayed for 120 days a new state law shifting control of oil and gas exploration sites, saying localities needed time to adjust to the change.
The measure, signed on Feb. 14 by Gov. Tom Corbett, shifted control of oil and gas exploration to the state from municipalities.The law was to have taken effect on April 14.
Judge Keith Quigley blocked implementation of parts of the law, saying the state's municipalities hadn't been afforded enough time to pass appropriate zoning laws.
Other parts of the law will remain in effect and the industry can continue to develop sites.
The suit was filed by six townships, a borough and an environmental group, the Delaware Riverkeeper Network.