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.
Through June 15, Ohio has approved 731 Utica shale permits.
Of that total, 358 wells have been drilled, according to the latest data from the Ohio Department of Natural Rresources.
A total of 102 wells are in production.
A total of 29 drilling rigs are working in Ohio.
A total of 25 new permits were approved: Five in Belmont County, 11 in Carroll County, two in Guernsey County, three in Harrison County, three in Noble County and one in Trumbull County.