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.
Texas-based Powell Shale Digest offers a new one-page summary of production and well data for nine major United States natural gas and crude oil regions.
The summary does not include Ohio's Utica shale.
But it does cover the Marcellus shale in Pennsylvania and West Virginia.
To date, there are nearly 36,000 wells with total production of nearly 23 trillion cubic feet of natural gas and 682 million barrels of oil and condensate from the Barnett, Fayetteville, Eagle Ford, Haynesville, Bakken and Marcellus shales.
The volume of natural gas and the barrels of oil were estimates since production began in each of the shale areas.
The numbers came largely from state regulatory agencies.
The question about the total U.S. shale production came from a French newspaper in Paris.
Click here for the link.