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 BP-Husky Refinery, an oil and gasoline refinery outside Toledo in the suburb of Oregon, got a $400 million upgrade.
The work took two years and 1,500 workers.
The project will make the refinery more efficient, less polluting and enable it to refine better grades of gasoline.
Right now the refinery gets most of its crude oil from Canada, but new sources of crude are starting to flow from Ohio itself, as well as Pennsylvania and West Virginia — from the Utica and Marcellus Shale.
The upgraded refinery has more flexibility to process different types of crude, including shale oil.
Click here to read more vfrom the Toledo Blade.