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 New Jersey Legislature late Monday accepted Gov. Chris Christie's recommendation for a one-year moratorium on hydraulic fracturing or fracking in drilling for natural gas.
The state was also mulling a total ban on the drilling practice that the industry says is needed and is safe. Critics contend that it may pollute drinking water and threaten public health.
The Senate and Assembly accepted Christie's conditional veto of legislation banning fracking outright.
The governor had returned the bill to the Legislature in August with the recommendation that the ban be lifted in one year rather than a permanent ban.
Environmentalists had pushed the Democratic-controlled Legislature to override the governor's conditional veto, but that didn't happen.
The decision is largely symbolic because New Jersey is not a big shale natural gas state.