AAPG / Energy Minerals Division

http://emd.aapg.org/

Arkansas Geological Commission

http://www.arkansas.gov/agc/agc.htm

Arkansas Oil and Gas Commission

http://www.aogc.state.ar.us/

Arkansas Geological Commission

http://www.state.ar.us/agc/agc.htm

Arkansas News Bureau

http://www.arkansasnews.com/

Oklahoma Geological Survey

http://www.ogs.ou.edu/

South Mid Continent PTTC

http://www.ogs.ou.edu/PTTC/