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 powerful Ohio Farm Bureau Federation is opposed to Ohio Gov. John Kasich's proposed severance tax on gas-oil drilling that would be turned into an income tax refund.
The group voted last at its annual meeting to oppose the measure.
Members said they were against any plan to increase the severance tax on oil and gas production solely for the purpose of instituting an income tax cut.
Instead, the group said any increase in the severance tax should be used to address local government funding, pay for infrastructure needs and economic development and mitigate negative impacts of oil and gas drilling on communities and the environment, Farm Bureau officials said.
The group also said changes to the severance tax should be part of a larger, comprehensive reform of Ohio's tax structure.