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.
Water-soil scientist Julie Weatherington-Rice will speak on drilling for natural gas in and near public water well fields on June 7 in Carroll County.
Her talk, sponsored by Carroll Concerned Citizens, will be at 7 p.m. in the Church of Christ, 363 Moody Ave., Carrollton.
She has been working with the village of Carrolton for years on itswell-protection plan.
Her presentation is geared to public officials, water department heads and private landowners.
It will look at public water protections of the aquifer in Carroll and surrounding counties.
For more information, go to www.carrollconcernedcitizens.org.