W & T Offshore Inc. W. P. Oil Ltd. Wagner Oil Co. Waldorf Corp. Walter International Wapiti Energy LLC. Ward Petroleum Corp. Warwick Oil and Gas Inc. Washington Energy Resources Watermark Corp. Watson Energy Inc. Waveform Energy Ltd. Weatherford International Wedge Group Inc. Wellspring Partners Wertheim Schroder & Co. Westco Energy LLC. Westech Energy Corp. Western Hub Properties LLC. Westhall Associates Inc. Westinghouse Credit Corp. Westmoreland Coal Co. Westport Resources Corp. Wexpro Co. White Oak Energy Whiting Petroleum Corp. Wichita River Oil Corp. Wildcat Petroleum Partners Wilshire Enterprises Inc. Winfield Energy Corp. Wintershall Oil and Gas Corp. Wold Oil Properties Inc. Wood Energy Corp. Woodlands Resources Co. Woodside Energy WPS Energy Services Wynn-Crosby Energy Inc. |
W. Mc Ilwaine Thompson, Jr. W. T. Neal Trust Wainoco Oil & Gas Co. Walsh Production Inc. Walters, Holt & Fields Ward Lake Energy Warren American Oil Co. Wascana Energy Inc. Washington Gas Light Co. Watford Energy Ltd. Wave Energy Ltd. WBI Production Inc. Wedge Energy Inc. Wells Fargo Energy Capital Wepco Energy LLC. West Newport Oil Co. Westcoast Energy International Western Gas Resources Inc. Western Operating Co. Westim Energy Westlinks Resources Ltd. Westport Oil & Gas Co. Inc. Westwin Energy I LP. WHC Trust White Stone Energy Whitmar Exploration Co. Wilbanks Exploration Inc. Williams Windsor Energy (U.S.) Corp. Wintershall Aktiengesellschaft Wiser Oil Co. Wolverine Exploration Co. Woodhurst Holdings Ltd. Woodside Australian Energy Worth National Bank WRT Energy Corp. Wyoming Minerals Ltd. |