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.
A grass-roots anti-fracking group in Medina County is now invited to participate in the county's Earth Day celebration on Saturday.
The Concerned Citizens of Medina County had been rejected as too controversial for Earth Day by a county committee last month.
Organizer Kathy Jones said she met on Tuesday with Tom James of the Medina County Park District and her group is back in as a participant.
She said she was very pleased by the county's reversal.
Her group has also been invited to participate in the county's speakers program, she said.
The Earth Day event will run from 10 a.m. to 4 p.m. at the Buffalo Creek Retreat in Guilford Township.