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Riviera Energy Corp. has been retained by an undisclosed party to sell operated gas properties in Maverick and Frio counties, Texas. The package includes a 57.8% working interest in production of 500,000 cubic feet of gas and 20 barrels of oil per day from 12 wells on 2,470 acres. For more information, contact Jeffrey Longbotham, 432-686-9400.