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.
Talisman Energy USA Inc. will pay a $62,457 penalty to settle alleged violations of hazardous chemical reporting requirements at 52 hydraulically fracturing facilities in Pennsylvania.
The fine was announced today by the U.S. Environmental Protection Agency.
The violations came from drill sites and compressor stations, the federal agency said.
Talisman discovered the violations and self-disclosed them to the EPA, the agency said.