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.
Three protestors were arrested in Trumbull County on Sunday during a lease-signing meeting between landowners and BP.
Arrested were Jonathan Sidney, Annie Lukins and Jeremy Bingham. They are scheduled to appear in court on Thursday.
Lukins of Cleveland held a press conference on the steps of the Youngstown jail.
"We're showing that arresting us won't make the problem go away," she said in a statement. "We won't stop and we won't allow real criminals like BP to destroy Ohio like they did the Gulf Coast. Safe fracking is a myth."
BP has leased about 85,000 acres in Trumbull County. It anticipates drilling its first wells into Ohio's Utica shale next year.