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DALLAS – Outstanding items from the estate of the late Texas and Oklahoma oil tycoon T. Boone Pickens – plus exceptional pieces from the stately R.L. Thornton Chateau mansion just outside of Dallas and other prominent estates – will all be packed into a monster four-day Texas Billionaires auction Sept. 12-15 by J. Garrett Auctioneers. Bid absentee or live online through LiveAuctioneers.