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.
Ohio has permitted 935 Utica shale wells, as of Oct. 19.
That includes 583 drilled Utica wells and 169 Utica wells that are in production, the Ohio Department of Natural Resources reports.
A total of 32 rigs are drilling in Ohio.
The eight newest permits are: Belmont County, 1; Carroll County, 2; Columbiana County, 1; Guernsey County, 1; and Noble County, 3.