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.
When it comes to safely fracking shale, bigger is better, the Via Meadia blog notes.
"Drilling giants like Exxon and Shell are safer and more ecologically responsible than their smaller competition," Via Meadia writes at The American Interest web site.
"In many industries, scaling up production actually leads to more mistakes and quality control issues, but oddly enough, when it comes to fracking shale in Pennsylvania, bigger companies violate regulations the least."
The full post is here.