• BP America Inc.

• Chevron Corporation

• ConocoPhillips

• EnCana Corporation

• Exxon Mobil Corporation

• Hess Corporation

• Hunt Oil Company

• Marathon Oil Company

• Murphy Oil Corporation

• Shell Oil Company

• Tesoro Petroleum Corporation

• Total S.A.

• Crown Central Petroleum Corporation

• Gulf Oil Limited Partnership

• Love's Country Stores, Inc.

• The Plaza Group

• Racetrac Petroleum, Inc.

• 7-Eleven, Inc.

• Sun Coast Resources, Inc.

• Sunoco, Inc.

• Truman Arnold Companies

• Valero Energy Corporation

• Plains All American

• Stone Energy Corporation

• Taylor Energy Company

• Tom Brown, Inc.

• TransMontaigne Oil Company

• True Companies, Inc.

• True Oil Company

• Unocal Corporation

• Van Operating, Ltd.

• Venoco, Inc.

• Vintage Petroleum, Inc.

• Ward Petroleum Corporation

• Westport Resources Corp.

• Xpronet, Inc.

• XTO Energy Inc.

• Baker Hughes Inc.

• BJ Services Company

• Cooper Cameron Corporation

• DeGolyer and MacNaughton

• GlobalSantaFe Corporation

• Halliburton Company

• Key Energy Services, Inc.

• Lone Star Steel Company

• McDermott International, Inc.

• Nabors Industries, Inc.

• National-Oilwell, Inc.

• Parker Drilling Company

• Patterson-UTI Energy Inc.

• The Petroleum Finance Company

• Rowan Companies, Inc.

• Schlumberger Limited

• Simmons and Company International

• S. W. Jack Drilling Company

• American Bureau of Shipping and Affiliated Companies

• Bechtel Group, Inc.

• Bollinger Shipyards, Inc.

• Dow Chemical Company

• Ethyl Corporation

• Fluor Corporation

• GE Power Systems

• STRATCO, Inc.

• ThermoEnergy Corporation

• Trade Ranger Inc.

• WELSCO,Inc.

• The Williams Companies, Inc.

• American Association of Petroleum Geologists

• Association of American State Geologists

• American Chemical Society

• American National Standards Institute (ANSI)

• American Petroleum Institute

• American Society of Mechanical Engineers

• Arctic National Wildlife Refuge (ANWR)

• Association of Petroleum Re-Refiners

• ASTM

• Cambridge Energy Research Associates

• Council of Petroleum Accountants Societies

• Gas Processors Association

• Independent Petroleum Association of America

• Institute of Petroleum (UK)

• International Association of Drilling Contractors

• International Organization for Standardization (ISO)

• Interstate Natural Gas Association of America

• Linde Gas

• Maine Oil Dealers Association

• Natural Gas Supply Association

• National Association for Black Geologists
and Geophysicists

• National Oil Recyclers Association

• National Propane Gas Association

• New York Mercantile Exchange

• Petroleum Industry Research Foundation, Inc.

• Petroleum Marketers Association of America

• Petroleum Technology Transfer Council

• Petrotechnical Open Software Corporation

• PKVerleger, L.L.C.

• Society of Petroleum Engineers

• Texas Independent Producers and Royalty Owners Association

• Western States Petroleum Association

• WZI Inc.

• Commonwealth of Massachusetts

• DOE Energy Information Administration

• DOE Fossil Energy Home Page

• U.S. Environmental Protection Agency

• U.S. Minerals Management Service (MMS)

• U.S. Executive Branch - Library of Congress Resource Page

• Arctic Slope Regional Corporation

• Center for Resource Management

• GO-Tech

• J. P. Morgan Securities Inc.

• Memphis Light, Gas & Water Division

• National Association of State Energy Officials

• New Mexico Institute of Mining and Technology

• Oil and Gas Journal

• PennWell Publications

• Petroleum Industry Calendar

• Refining Online

• sci.geo.petroleum Internet Resources

• Stanford University, Energy Modeling Forum

• University of Texas at Austin, Department of Petroleum and Geosystems Engineering

• University of Texas at Austin Petroleum Extension Service (PETEX)

• Natural Gas Week Index