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.
It was a busy week for Utuica shale permits in Ohio.
The Ohio Department of Natural Resources' Division of Oil and Gas Resources Management issued 22 new permits in the week ending May 11.
That covers five permits for Carroll County, eight in Harrison County, one in Jefferson County, two in Mahoning County, five in Noble County and one in Trumbull County.
Thgat brings the number of Utica shale permits to 660. Of that total, 326 wells have been drilled and 97 wells are in production.
A total of 31 rigs are drilling in Ohio.