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.
A consultant reports that the shale boom in the United States is creating reuse options for a closed refinery near Philadelhphia.
IHS says the boom could trigger development options that might otherwise not exist for the Marcus Hook Industrial Complex.
The one-time Sunoco refinery on the Delaware River sotuh of Philadelphia closed last December.
The 780-acre facility once processed 175,000 barrels per day of crude oil into a wide range of petroleum and petrochemical products.
About 500 workers were employed at the refinery.
IHS was hired by Delaware County to explore redevelopment options.
It has outlined seven options, most tied to the processing of natural gas, oil and the so-called wet gases: ethane, butane and propane.