AEP/PSO Affiliated Tax Air Liquide Aka Energy Group Anadarko Gathering Company Aquila, Inc. Arkansas Oklahoma Gas Corp. AT&T Atlas Pipeline Mid-Continent, LLC Atmos Energy Corp. Atoms Energy Birch Telecom, Inc. BP America Burlington Northern & Santa Fe Railway Co. Burlington Resources Oil & Gas CBIZ Property Tax Solutions CenterPoint Energy Chaparral Energy Chesapeake Energy Corporation Chevron. CITGO Petroleum Corp. Colorado Interstate Gas Company Compressor Systems Inc. ConocoPhillips Continental Gas, Inc. Continental Resources, Inc. Cross Timbers Oil Company DCP Midstream Deloitte & Touche Devon Energy Corp. Dominion Resources Inc. DuCharme McMillen & Associates Duff & Phelps Duke Energy Corporation Duke Energy Field Service DuPont El Paso Corporation Elias, Books & Brown Enbridge Energy Company, Inc. Enogex, Inc. EOTT Energy Corporation Explorer Pipeline Company ExxonMobil Corporation Farmer Union Coop. Farmland Industries, Inc. Gary-Williams Energy Corporation Hall Estill Helmerich & Payne, Inc. Kansas City Southern Railway Company K.E. Andrews & Company Kerr-McGee Corporation Kinder Morgan Koch Business Solutions, Inc. Lewis Pratt & Associates Locin Oil/NCL Magellan Midstream Partners, L.P. Marathon Oil Company MCI Worldcom McKinney & Stringer, PC Mid-Continent Oil & Gas Association Mustang Fuel Corporation Northern Natural Gas Co. OGE Energy Corporation ONEOK OXY Services, Inc. Pioneer Telephone Cooperative Post Oak Oil Company R.E. McElroy LLC (All American Pipeline LP) SandRidge Energy, Inc. Sartain/Fischbein & Co. SBC Communications Shell Oil Co. SKO Railroad Southern Star Central Gas Pipeline Southern Union Co. Southwest Airlines Company Sprint Corporation Sure-Tel, Inc. T-Mobile Tenaska Texas, Oklahoma & Eastern Railroad The Armstrong Company Tierra Uell-Mcheee Corporation Union Pacific Corporation Unit Corporation Valero Energy Corp. Verizon Wireless Wal-Mart Stores West Texas Gas, Inc. Western Gas Resources Williams Companies Wiltel Communications Xcel Energy
Oklahoma Association of Tax Representative webmaster: oatr@oatr.org
