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 Wall Street Journal on Tuesday noted that President Barack Obama has acknowledged natural gas from shale.
Last week, the White House issued its latest report on job and that included a section on America's Natural Resources Boom.
The development of Marcellus and Utica shales and hydraulic fracturing or fracking has "led to rapidly growing domestic production and relatively low domestic prices for households and downstream industrial users," the White House said.
Shale development could trigger an economic boom, the White House said.
The Wall Street Journal says that assessment appears to the first time that Obama has favorably mentioned the Marcellus shale that is centered in Pennsylvania.
The White House announcement did mention that appropriate care must be taken with hydraulic fracturing to assure there are no health or environmental problems.