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 Apache Corp. agreed to buy Denver-based Cordillera Energy Partners III LLC for $2.85 billion in cash and stock.
The deal more than doubles Apache's holdings in the Anadarko basin in western Oklahoma, the Texas Panhandle and nearby states. It adds estimated reserves of 71.5 million barrels of oil equivalent, the Houston-based company said on Monday.
The purchase will be paid for with $2.25 billion in cash and $600 million in stock. It includes 18,000 barrels a day of existing production