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.
An anti-fracking rally is planned at 2 p.m. Wednesday, April 18, in Columbus by anti-fracking groups across Ohio.
The 60-minute rally is scheduled to be held on the West Lawn of the Ohio Statehouse.
The event is being organized by No Frack Ohio, a statewide grass-roots group.
It intends to release a new analysis comparing Ohio's proposed rules on drilling for natural gas with rules in Pennsylvania and Texas and identifying areas where Ohio is falling behind on protections.
The protestors will then attend the 3 p.m. meeting of the Ohio House Agriculture and Natural Resources committee.
State Rep. Bob Hagan, D-Youngstown, is seeking House support from his proposed legislation that would give local communities more control over drilling.
The activists are expected to push for public hearings on six proposed bills on fracking that are pending in the Republican-controlled committee.
No Frack Ohio is calling for a day of political action on Thursday, April 19.
For more information, go to www.nofrackohio.com.