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.
Drillers in Ohio's Utica shale must track the number of jobs going to Ohioans and non-residents.
That provision was part of the state's new drilling law approved by the Ohio Legislature and signed by Gov. John Kasich.
The job-tracking provision was pushed by State Sen. Lou Gentile, D-Steubenville.
It was the only amendment by a Democrat to be added to the bill.
The amendment, called Ohio Workers First, requires the Ohio Department of Job and Family Services to track hiring of residents and non-residents and to create an annual report, says Marcellus Drilling News.
The goal of the amendment is to show improved economic results from drilling but also to put pressure on the industry to hire more Ohioans, it said.
Click here to read the Marcellus Drilling News account..