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 Youngstown-based Business Journal reports that Avalon Holding Corp may develop two new injection wells for drilling wastes.
Such a move would be a new venture for the Vienna-based company, said CEO Ron Klingle.
Ohio is tightening up on its rules on injection wells after 13 small earthquakes rattled the Youngstown area in the last 15 months.
The quakes have been linked to a now-closed injection well just west of Youngstwon in Mahoning County.