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 number of Utica shale permits in Ohio has climbed to 335.
That's based on the latest data from the Ohio Department of Natural Resources' Division of Oil and Gas Resources Management.
A total of 105 wells have been drilled, as of the week of Aug. 5, the state agency reported.
The number of permits climbed in Carroll County to 124. It is No. 1 in Ohio.
Other counties with number of permits are Columbiana, 48; Harrison, 28; Jefferson, 26; Monroe, 17; Guernsey, 16; Noble, 12; Mahoning, 12; Belnont, 7; and Tuscarawas, 7.
Locally, there are 13 Utica permits for Stark County, 10 in Portage, one in Medina and one in Wayne.