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.
Ohio Treasurer Josh Mandel has upset more thana few anti-fracking activists across Ohio with his comments.
Republican Mandel, who is also running for the U.S. Senate seat held by U.S. Sen. Sherrod Brown, spoke in Cleveland on Thursday at a program staged by a Cleveland law firm.
He warned that Ohio should not let outside environmental organizations hinder development of oil and gas exploration in Ohio.
In comments reported by the Cleveland Plain Dealer, Mandel said "radical environmentalists" were intent on doing everything possible to block drilling development in Ohio.
"There's going to be lots of dollars descending on Ohio from a lot of these radical organizations to try to stop this exploration in Ohio," he said. "There's a misinformation campaign afoot and it's funded from Hollywood. It's funded from Manhattan. It's not funded from the heartland."
Later Mandel said most of the opposition to drilling has come from grass-roots groups and that the paper called fringe environmental groups, not mainstream environmental groups.