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 horizontal drilling, not fracking, of deep underground shale to tap the entrapped oil and natural gas is today's real technological wonder in the oil industry, says Dave Blackmon at Forbes magazine.
Blackmon: "... the real marvel is the innovation that has take place in the realm of Horizontal Drilling.
"Think about what this advancement has meant just in terms of access to the resources: When drilling into a hydrocarbon bearing formation 100 feet thick, vertical drilling would allow an operator to contact 100 feet of rock, which would limit your potential recovery to whatever oil or gas would flow into that length of pipe. Horizontal Drilling now allows these same operators to drill and set pipe for a mile or more horizontally through this same rock formation.
"You are now contacting and 'Fracking' 5,200 feet of rock rather than 100 feet, which multiplies expected well recovery rates many times over.
" The technology employed is so advanced and exacting that drillers today can hit a target at the end of a drill string that is 10,000 feet vertical with a mile long horizontal section that is no more than a few inches in diameter"
Read Blackmon's column here.