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 Marietta Times this week reported that a processing plant for natural gas in southeast Ohio is being moved.
Denver-based MarkWest Energy said the plant will be built in Noble County, not Monroe Count.
Company officials did not explain why the plant was being shifted to the west.
Gov. John Kasich in February had announced that MarkWest planned to construct gas-processing plants in Harrison and Monroe counties, plus a fractionation, storage and marketing facility in Harrison County.
The facilities are part of a joint venture with the Energy & Minerals Group.