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 U.S. Energy Information Agency has created an animation map showing how the Bakken shale field has developed over the years, through 2010.
EIA reports: "... the Bakken drilling and production animation above shows that drilling activity built up gradually and eventually led to rapid growth, particularly from 2006 to 2010. Production grew because of increased use of horizontal drilling and the addition of hydraulic fracturing, coupled with elevated prices for crude oil and other natural gas liquids.
"North Dakota is now the nation's fourth largest oil-producing State—trailing only Texas, Alaska, and California—due mainly to Bakken production gains. According to the State's Department of Mineral Resources, total North Dakota oil production averaged 445 thousand barrels per day (bbl/d) in August 2011, up from an average of 344 thousand bbl/d at the end of 2010."
Here is the link to the animation: http://www.eia.gov/todayinenergy/detail.cfm?id=3750