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.
An independent expert has recommended that Cuadrilla Resources Ltd. should be allowed to continue hydraulic fracturing or fracking in the United Kingdom, Bloomberg News reported on Tuesday.
Future gas operations elsewhere in the U.K. should be assessed prior to starting, said the report by the Department of Energy and Climate Change.
Cuadrilla suspended fracking operations last year after two small earthquakes occurred in northwest England where it was drilling.
The report recommends that fracking should be halted temporarily if there is a tremor greater than a magnitude 0.5. Cuadrilla says that is acceptable.
The two quakes last spring were magntitudes 2.3 and 1.5.