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.
New York is considering lifting a three-year moratorium on drilling into the Marcellus shale.
Today is the deadline for public comment on the proposal, and New York had gotten 21,000 comments through Monday.
A pro-drilling coalition turned in 10,000 signatures to the New York Department of Environmental Conservation, while a coalition of eco-groups submitted more than 12,000 commentsagainst the drilling.
New York conducted a four-month public comment period.