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Anatomy of the heart, illustration. On the left, the heart is seen from the front. On the right, it is seen from behind. From Sobotta, J. and McMurrich, J.P. (1914) Atlas and textbook of human anatomy. Vol 2, The viscera including the heart. W. B. Saunders, Philadelphia (Figs. 518, 519). (KEYSTONE/SCIENCE PHOTO LIBRARY/MICROSCAPE/SCIENCE PHOTO LIBRARY)