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.
From Dan Alfaro of Energy in Depth-Ohio, a pro-drilling industry group:
"As the state (Ohio) emerges as a leader in domestic energy production with the continued development of the Utica shale, it is also setting the standard in its regulatory system for developing states across the U.S.
"The passage of this bill gives the state the most robust, transparent and comprehensive oil and gas regulations in the country.
"This is something Ohioans across the board should be proud of."