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.
Halliburton broke ground last week on a new facility in Zanesville to house up to 300 workers in eastern Ohio's Utica shale.
Gov. John Kasich participated in the ceremonies on Tuesday on 178 acres.
The first workers are expected to be in the new 135,000-square-foot facility by the end of the year, the Zanesville Times Recorder reported.
The price tag for the building is $35 million to $50 million.
The company has hired more than 100 Ohioans and they are training in Pennsylvania, the paper said.
Halliburton intends to fill 70 percent of its job openings with local workers.
Ohio invested $4 million on site improvements through its Job Ready Site program.
Halliburton is a major well service company/contractor.
It is building similar facilities in Texas, North Dakota and Alaska and is expanding its operations in Williamsport, Pa.