ABARTA Oil & Gas
Ardent Resources
Belden & Blake Corp
CGas
Columbia Natural Resources
Douglas Oil and Gas
East Resources
Eastern American Energy Corp
EOG Resources
Great Lakes Energy Partners LLC
National Fuel Gas
Nornew, Inc
Pennsylvania General Energy
Phillips Production Company
Resource America, Inc
Sampson Resources
Science Applications International Corp
Talisman Energy (Fortuna)
Texas Keystone
Thomasson Partner Associates
Triana Energy
US Energy Development Corporation