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.
Lazst week, the Pennsylvania Defense Foundation filed a lawsuit against the governor, budget secretary and state treasurer.
The suit alleges thay they violated Pennsylvania's constitution by failing to protect state parks and state forests.
The group had originally filed a notice of the suit in March 2010.
The foundation charges that state officials diverted hundreds of millions of dollars in gas rents and royalties away from the Department of Conservation and Natural Resources. Instead, that control has been shifted to the governor and the General Assembly and the parks and forests have suffered, the founation says.
Pennsylvania in 2009 and 2010 leased more than 64,000 acres of state forest lands to drillers.