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. Bureau of Land Management said today it will use industry standrads for cementing natural gas wells.
Cementing is the "most critical part of the drilling operations," Robert Abbey, director of the bureau said in testimony before a House committee.
The federal agency is drafting rules for natural gas production by hydraulic fracturing or fracking.
It could release a draft version of the rules on public lands for public comment in early April.
The rules will adopt American Petroleum Institute standards for cementing and will requyire that drillers prove the actual job as consistent with enguineers' drawings provide before the work began.