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.
Drilling on public lands is becoming a hot issue in Utah, according to PBS.
The state is home to five national parks, several holistic American Indian reservations and potential large volumes of natural gas.
Anadarko Petroleum Corp. is seeking to renew past oil drilling permits that are expiring.
The company is seeking approval from the U.S. Bureau of Land Management to reopen previous oil wells and build new ones in the Greater Natural Buttes region.
This has angered environmental groups like the Wilderness Alliance.
Recently, Gasco, a natural gas company, won approval for nearly 1,300 wells in Utah's Desolation Canyon, one of the largest roadless wilderness areas in the Lower 48 states.