The author died in 1935, so this work is in the public domain in its country of origin and other countries and areas where the
copyright term is the author's life plus 80 years or fewer.
{{Information |Description= Diagram of the evolution of Titanothere horns |Source=The Origin and Evolution of Life |Date=1918 |Author=Henry Fairfield Osborn |Permission= Public Domain |other_versions= }}
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