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Leonardo da Vinci (Vinci 1452-Amboise 1519)

Recto: Studies of the nerves and muscles, the heart, and optics. Verso: Blood flow through the aortic valve  c.1512-13

Recto: Pen and ink. Verso: Pen and ink, over some black chalk | 30.7 x 43.8 cm (sheet of paper) | RCIN 919116