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.
Coal mine water might prove to a viable source of water for hydraulic fracturing or fracking in Pennsylvania, says a study by the RAND Corp.
The report was commissioned by the pro-drilling Marcellus Shale Coalition, after such a possibility was raised in late 2011 at a roundtakle discussion hosted by RAND.
The use of mine water could prove to be a safe, efficient and environmentally friendly way to find enough water for the fracking in the future, said Kathryn Z. Klaber, president of the coalition.
Using such water is technuically viable because it is abundant, near drilling sites and would require only minimal treatment, the study says.
Additional reserach would be needed to determine the full technical and economic viability of such a move, the study says.
Existing laws and regulations discourage the use of mine water and any legal or regulatory changes to encourage use must be carefully considered, the report says..