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 Associated Press reported today that authorities in eastern Ohio are getting numerous 911 telephone calls about a red glow in the night sky.
Jefferson County officials tracked the red skies to "flaring" or burning off natural gas at newly drilled wells.
The flaring can last for up to 10 days, said Chesapeake Energy Corp., the Oklahoma-energy firm that is a big player in Ohio's developing Utica shale.