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.
The rest of the world lags the United States in fracking for a number of reasons, writes Jeff McMahon at Forbes magazine.
McMahon: "Shale gas deposits have been found in Poland, Argentina, China, Great Britain and other countries, but only the United States has fracked its shale gas into a national energy boom.
"That’s not for lack of will abroad, according to energy experts gathered Friday at the University of Chicago: it’s because of political and economic circumstances that fostered hydraulic fracturing here while dampening its spread overseas."
The full story is here.