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.
Attorney Thom Cmar of the Natural Resources Defense Council is not satisfied with what Ohio plans to do to tighten up its rules on injection wells that handle the briny waste from hydraulic fracturing or fracking of natural gas-oil wells.
On Wednesday,the NRDC submitted a letter with suggestions to the Ohio Department of Natural Resources.
Click here to read Cmar's NRDC blog on what he thinks of what's happening in Ohio.