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.
Bloomberg News reports that natural gas-oil industry is already looking into super fracking to extract even more natural gas and oil.
That would require creating longer and deeper cracks in underground rocks to release more natural gas and oil. Companies want to boost production and lower costs.
Some companies are looking to create larger crevices in the richest zones. Others are focusing on splintering the shales into a web of tiny fissures.
The industry is aware that critics who fear fracking will likely fear super fracking even more.
Here's the story.