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.
From the Associated Press:
PHILADELPHIA (AP) — The Coast Guard says a train carrying crude oil from North Dakota has derailed on a bridge over a river in Philadelphia.
Local police contacted the Coast Guard at about 1 a.m. today to report that a train had derailed on the Schuylkill Arsenal Bridge.
The Coast Guard says in a news release that a small crew on a boat is monitoring the derailment near the bridge and another team that monitors for pollution is also at the scene.
Authorities say there's no report any of the oil has leaked from the cars.
It's not yet clear what may have caused the train to derail.