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.
According to The Hannah Report, one township in Carroll County is the Ohio epicenter of Utica drilling.
Rick Simmers, chief of the Ohio Department of Natural Resources' Division of Oil & Gas Resources Management, identifed Loudon Township.
To date, the state has permitted 80 wells in the township, of which 45 have been drilled.
None are in production because there are still no pipelines, Simmers said.
He told the audience at a Baker Hostetler shale symposium that the Loudon wells are "very, very good wells."