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.
A Texas-based energy company has received the first Utica shale permit for Ohio's Ashtabula County.
Beusa Energy LLC got a permit from the Ohio Department of Natural resources to drill in Wayne Township.
Drilling is under way south of Ashtabula in Trumbull County.
That permit is among 18 new permits approved by Ohio.
Eight new permits are in Carroll County, one is in Columbiana County, one is in Guernsey County, four are in Harrison County, two are in Jefferson County and one is in Trumbull County.
As of June 8, Ohio has 711 active Utica shale permits, of which 355 wells have been drilled.
A total of 102 wells are in production.
A total of 29 rigs are working in Ohio. the state reports.