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.
Reports from New York indicate that Gov. Andrew Cuomo will unveil a plan before Labor Day to allow limited horizontal drilling in southern New York.
That action would end a four-year moratorium on horizontal drilling and hydraulic fracturing or fracking in New York state.
Under the latest plan, drilling would be limited to 50 wells in 2013 and 100 wells in 2014.
Earlier, it had been said drilling might be limited to five counties on the New York-Pennsylvania border: Tioga, Broome, Chemung, Chenago and Steuben.
Local communities would also have to approve such drilling into the Marcellus shale.
Click here to read the latest from the Marcellus Drilling News.