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.
French energy giant Total earlier this week said it was halting further investments in American shale plays including Ohio's Utica shale, the Marcellus Drilling News reported.
The reason is the low prices for natural gas in hte United States.
Total had purchased a 25 percent investment from Chesapeake Energy Corp. in 10 counties in eastern Ohio for $2.3 billion.
It later purchased a 90 percent stake in 9,000 leases in Columbiana County for an additional $2 billion, says the Marcellus Drilling News.
It has joint ventures in Texas, too.
Total said it intends to focus on shale development in Argentina and China.