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SD T. rex could bring $30 million or more at auction

The mounted skeleton of 'Gus' on display at Sotheby's in New York, where it is being auctioned. The Tyrannosaurus Rex fossil was excavated on private land in Harding County, S.D. (Photo: Malcolm Ritter)

PA Tyrannosaurus rex fossil discovered on a ranch in western South Dakota will be auctioned off in New York City on Tuesday with a possible sale price of $30 million or more.

The 38-foot long skeleton,…