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.
Last Wednesday, a Pennsylvania judge rules that the Act 13 zoning provisions were unconstitutional, in the middle of a legal appeal.
Judge Pelligrini ruled that the original July 28 order stating that the zoning parts of Act 13 are unconstitutional will stand until the case is heard by the state Supreme Court. That provides clarity for townships during the appeal.
In the original ruling, the Commonwalth Court said parts of Act 13 that took away local control over drilling and gave it to the state were unconstitutional. The state appealed that decision.
Seven townships challenged the Act 13 zoning rules.