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.
Energy companies are flocking to south Texas where new wells have triggered a 230-fold increase in crude oil output in three years.
The liquid-rich Eagle Ford shale is getting new attention, especially with the price of natural gas so low, Bloomberg News reports.
"The Eagle Ford is the top basin we have in the world today," David Roberts, COO at Marathon Oil, told analysts and investors last month on a conference call.
Marathon Oil Corp.and ConocoPhillips both plan to double their production in the Eagle Ford this year.
Oil production in the Eagle Ford jumped nearly sevenfold in 2011 to surpass 30 million barrels.
That's stll less than the Bakken shale in North Dakota. But the Eagle Ford shale is accessible and cheaper to drill and closer to refineries. There is less risk than foreign shale investments.
The Eagle Ford cuts a 400-mile swath across south Texas