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.
Pittsburgh radio station KDKA is hosting the third annual Western Pennsylvania Marcellus Shale Expo on Thursday near Pittsburgh.
It will run from 9 a.m. to 5 p.m. at the Regional Learning Alliance, 8509 Cranberry Woods Dr., Cranberry Township.
Range Resources is sponsoring the expo.
It is free and open to the public.
The programs includes talks, pannel discussions and exhibits.
More information is available at www.kdka.com/marcellus.