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 Obama administration's newly proposed fracking rules have a major limitation: They only apply to a sliver of the nation's natural gas-drilling lands.
ProPublica's Lena Groger reports that the proposed federal rules only apply to U.S. Bureau of Land Management and Indian lands, not to U.S. Forest Service, private or state-owned lands.
The land to be covered by the proposed rules make up 11 percent of the country's natural gas supply and 5 percent of its oil supply, she wrote.
You can read her story here.