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.
Hart Energy reports that Ohio's lack of transparency on drilling production data may slow development in the Utica shale.
Thomas Pritchard of California-based Imperial Capital LLC saidat a Pittsburgh conference that the lack of production data from Ohio is troubling, Hart Energy says.
Ohio requires once-a-year production totals in March.
To date, companies have offered preliminary data on only 16 wells.
To date, Ohio has permitted 457 wells, of which 187 have been drilled. A total of 45 are in production, as of Nov. 24.
A total of 29 rigs are working in Ohio,