American Exploration

Halliburton Energy Services

Amirmex Oil & Gas Co.

Hilton Petroleum Ltd.

APEX Petroleum Engineering

Intrepid Production

Apollo-Smith Exploration

Interline Resources Corporation

Arch Petroleum Inc.

KFG Petroleum Corporation

Armstrong Oil & Gas

Key Production Company

Baker & Hostetler, P.C.

L.G. & E. Natural

Ballard Petroleum, L.L.C.

Macauley, A. G. Trust

Barrett Resources

Merrion Oil & Gas

Basin Operating Company

Natural Gas Pipeline

Brown, Charles W.

N.G. Resources Corporation

Calaway Oil & Gas Company

OGI Inc.

Captiva Rsources, Inc.

Pacific Enterprises Oil Co.

Coastal Chemical

Petrogulf Corporation

Colorado Attorney General

Pioneer Oil and Gas Company

Colorado Interstate Gas

Prima Exploration

Conley P. Smith Operating Co.

Questa Engineering

Cramer Oil Company

Richland Petroleum Corporation

Daube Company

Sante Fe Energy

DiGiacomo & Jaggers, P.C.

Stanley Energy

Don Stinson, P.E.

Star Resources

Ener-Tech Associates Inc.

Summit Energy

Ewing & Ewing, P.C.

Teton Oil & Gas

Fancher Oil Company

TRANSOK

FAN Energy Inc.

Williams Pipe Line Co. /DLS

First National in Palm Beach

Wyoming Resources Corporation