On this day in 1980, American oil tycoon Armand Hammer pays $5,126,000 at auction for a notebook containing writings by the legendary artist Leonardo da Vinci. The manuscript, written around 1508, was one of some 30 similar books da Vinci produced during his lifetime on a variety of subjects. It contained 72 loose pages featuring some 300 notes and detailed drawings, all relating to the common theme of water and how it moved.
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