Ardent Resources, Inc.
Baseline Oil and Gas
Benchmark Oil & Gas Company
Black Hills Corporation
Black Warrior Basin Trust
Buccaneer Resources LLC
Castle Energy Corporation
CDX Gas LLC
Cedar Creek Oil Company
Consol Energy Inc.
CNX Gas Company
CNG Producing Company
Constellation Energy
Delta Petroleum Corporation
Devonian Resources, Inc.
Dominion Exploration & Production, Inc.
Dune Energy
Empire Energy USA LLC
Enron Oil and Gas (Florida Gas, Northern Natural Gas Company)
EOG Resources (Enron Exploration Company)
Equitable Resources Energy Co.
ERG Resources, L.L.C.
Feliciana Corporation
Fidelity Oil Company
Ginger Oil Company GLG
Glickenhaus Energy Corp.
Graves & Co.
HighMount Exploration & Production LLC
Holliman Oil Corporation
Huntley & Huntley, Inc.
J.P. Oil Company
Kansas Natural Gas Inc.
Krescent Energy Company
Michigan Consolidated
Michigan Exploration Inc.
Meridian Oil Inc.
National Fuel Exploration Corp.
Natural Gas Corporation of California
New Dominion, LLC
NGC Energy Companies
NJ Natural Resources
Northern Oil & Gas, Inc.
ONEOK, Inc.
ONEOK Resources Company
ONEOK Field Services
PetroEdge Resources, LLC
Petrogulf Corporation
Portbush Petroleum
Prarielands Energy Marketing, Inc.
ROCH, S.A.
(Argentina)
Seneca Resources Corporation
Skylark Energy, LLC
Standford University
Stonegate Production Company, LLC
Sylvan Energy, LLC
Tekoil and Gas Corporation
Tema Oil & Gas
Texas Keystone Incorporated
Total Minatome Corporation
Vinland Energy
Woolsey Petroleum Corporation
Xanadu Exploration Company
Apco Argentina, Inc.
Asociacion SMC-Pacifpetrol-Andipetroleos-Santa Elena Oil & Gas Corp.
China North East Petroleum Holdings
Consoraio Petrobell Inc.–Grantmining S.A.
Emerald Oil & Gas NL
Enron Exploration Company
Global Energy Development, PLC
Integrated Petroleum Consultants Pvt. Ltd.
North European Oil Royalty Trust
Orient Petroleum, Inc.
Quetzal Energy, Inc.
ROCH, S.A. (Argentina)
Sinopec International Exploration and Production Corporation
Sovereign Oil & Gas Co.
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Alberta Southern Transmission Company
ANR Pipeline Co.
Alabama Gas Corporation
Atlas Pipeline Mid-Continent
Columbia Gas System, Inc.
Consolidated Natural Gas Company
Copano Energy
Dominion Transmission Co.
Gas Company of New Mexico
Sunterra Gas Gathering Company
Kansas Natural Gas Company
Leviathan Gas Pipeline Company
Montana Dakota Utilities Company
National Fuel Gas Company
Northern Natural Gas Company (Enron)
Oklahoma Natural Gas Company
Pacific Gas Transmission Company
Prairielands Energy Marketing, Inc.
Scissor Tail Energy, LLC
Skylark Pipeline
Southern Natural Gas Company
Tennessee Gas Transmission Corp.
Texas Eastern Transmission Corp.
Texas Gas Transmission Co.
Transcontinental Gas Pipeline Corp.
Transwestern Pipeline
United Gas Pipeline
Williston Basin Interstate Pipeline Co.
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Aetna Life Insurance Co.
Annuity Company
Bank of America Trust Department
Bank of New York, Corporate Trust Dept.
Bank One
Boatmen's Bank of Oklahoma
Canadian Imperial Bank of Commerce
CarVal Investors, LLC
Chase Manhattan Bank
Chemical Bank
Citibank N.A.
Comerica Bank-Texas
Commonwealth Bank of Australia
Compass Bank
Donaldson, Lufkin & Jenrette Securities
Energy Spectrum
Equitable Life Assurance Society U.S.
Equity General Insurance Co.
First Bank Northwest, MN
Friedman, Billings, Ramsey & Company, Inc.
Gershon Lehrman Group
Golman Sachs
Hellman & Friedman Advisors LLC
WR Huff Asset Management Co., L.L.C.
J.P. Morgan Interfunding Corp.
John Hancock Mutual Life
Kansas City Life Insurance Company
Kidder Peabody and Co., Inc.
Lehman Brothers
Manufacturers Hanover Trust Co.
Macquarie Bank Limited
Metropolitan Life Insurance Company
Natixis
New England Mutual Life Insurance
Prudential Capital Corp.
Rauscher Pierce Refsnes, Inc.
Smith, Barney, Harris Upham & Co.
State Farm Insurance Company
TransAmerica Life Insurance and Annuity
Travelers Insurance Company
Wayzata Investment Partners
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