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 American Legislative Exchange Council, better known as ALEC, has been in the spotlight for its support of controversial legislation like Florida's Stand Your Ground provision.
The conservative non-profit group has been pushing for industry-backed model legislation that lets oil and gas companies muddy the water of fracking chemical disclosure rules, said ProPublica's Cora Currier.
She writes that the model bill was sponsored by ALEC by ExxonMobil through its XTO Energy subsidiary that is a player in Ohio's Utica shale.
ALEC has claimed that legislators in Ohio, Pennsylvania, New York, Illinois and Indiana are supporting its model disclosure legislation, she writes.
The states vary greatly as to what chemical disclosure rules they have.
Ohio is tightening up its drilling rules in on-going debate on Senate Bill 315 supported by Gov. John Kasich and by rule-making within the Ohio Department of Natural Resources. That process is continuing.
You can read the ProPublica story here.