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 cover story in Thursday's USA Today was a look at the natural gas shale boom that is under way in Ohio and 19 other states.
About 35 new wells are drilled daily or 13,000 a year in those 20 states, said reporter Dan Vergano.
The number of natural gas wells in the United States has grown from 342,000 in 2000 to 510,000 in 2010, according to the U.S. Energy Information Administration.
The development of shale gas drilling has impacts that are just being realized, the article says.
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