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Keywords: Titanothere1.png ru Diagram of the evolution of Titanothere horns Top to bottom Brontotherium Protitanotherium Manteoceras Eotitanops 1921 The titanotheres of ancient Wyoming Dakota and Nebraska by Henry Fairfield Osborn; Washington D C United States Department of the Interior U S Geological Survey 1929 pg 711 E S Christman other versions PD-old-70-1923 Uploaded with UploadWizard Brontotheriidae Henry Fairfield Osborn |