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.
Here are some tidbits from the 2011 annual report filed by the Ohio Department of Natural Resources and its Division of Oil and gas Resources Management:
1. Ohio has 64,481 operating wells with 5,722 registered well owners.
2. In 2011, the division issued 1,533 permits including 690 drilling permits. It issued 131 urbanized area permits in 19 counties. The 1,533 total is 21 more than 2010. Utica shale permits accounted for 10 percent of the total or 66 permits
3. In 2011, Ohio had 460 oil and gas wells drilled in 42 of Ohio's 88 counties. That included 19 in Summit County; 16 in Portage, 43 in Stark, 10 in Wayne, two in Medina and 14 in Cuyahoga
4. The most wells were drilled in Stark and Knox counties, both with 43 new wells.
5. A horizontal well in Carroll County was drilled to a record length of 14,445 feet or nearly three miles. Most Utica shale wells are between 7,600 and 7,820 feet
6. A total of 355 wells were plugged in Ohio in 2011.
7. In 2011, Ohio produced 4.8 million 42-gallon barrels of oil with an average price of $90.06 per barrel. That's a 1.43 percent increase from 2010.
8. In 2011, Ohio produced more than 73 billion cubic feet of natural gas with an average price of $4.28 per million cubic feet. That's a decline of 6.18 percent from 2010.
9. The combined value of Ohio's 2011 oil and gas production was in excess of $747 million.
To see the full report, click here.