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.
GDF Suez SA, operator of Europe's biggest natural gas network, said it may consider investing in U.S. shale gas for export to Asia as demand grows, Bloomberg News reported.
American shale production assets would be too expensive, but GDF Suez may study investments in liquefaction and supply contracts, Deputy Head of Gas Jean-Marie Dauger said on Wednesday at a Paris conference.
"We could look at the downstream part," he said of possible spending on supplies for export from 2017.
GDF is watching projects to develop U.S. gas export terminals for liquified natural gas that would be shipped in tankers, Dauger said.
His company has a LNG import terminal near Boston and no shale gas assets.