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 Marcellus Drilling News reports that Heckman Corp. is merging with Power Fuels and moving from Pittsburgh to Scottsale, Ariz.
Heckman is a publicly traded environmental services company that is involved in the Marcellus and Utica shale booms.
Power Fuels, a privately traded firm. is based in North Dakota where the Bakken shale boom is under way. It is the largest firm in the Bakken development.
With the merger, Heckman is poised to become one of the largest drilling service companies in hte United States.