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.
The Zanesville-Muskingum County Chamber of Commerce is opposed to Ohio increasing the severance tax on oil and gas at this time.
The chamber said it is not opposed to Gov. John Kasich's plan to decrease the state personal income tax.
But it should be a higher priority for Ohio to encourage the economic growth of the drilling industry, the chamber said in a Tuesday statement.
"We are competing for oil and gas investment with other areas of the nation and the world, just like in all types of business attraction. Higher taxes will make it more difficult to compete with other places," the chamber said.
It added, "We are not willing to risk this new opportunity."