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.
A bill than would outright ban hydraulic fracturing for natural gas in Maryland died in a Senate committee, but a bill imposing a moratorium on the practice pending studies remains alive in the General Assembly.
Senate Bill 514 was defeated in committee Tuesday.
However, a bill to place a moratorium on natural gas drilling via fracking remains alive,
The Maryland Hydraulic Fracturing Moratorium and Right to Know Act of 2013 remains under consideration by the House of Delegates.
The shale formations in Maryland are located only in Garrett and Allegany counties.