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 pro-drilling Marcellus Shale Coalition wants uniform drilling rules in Pennsylvania.
Since Oct. 1, 27 municipalities in 11 have considered or adopted new industry rules, says Gene Barr, president and chief executive officer of the Pennsylvania Chamber of Business and Industry.
A total of 115 Pennsylvania municipalities have adopted more than 145 ordinances including land-use limitations, road-use restrictions, noise limits and well setback requirements, he says.
Many are designed to ban drilling, he says.
Uniform statewide rules on the industry would be better than a piecemeal approach, he says.
Such oversight must be done right and done quickly, if the Marcellus shale drilling is to continue, he says.
You can read his comments in an op-ed column in the Patriot-News here.