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“Cross-section of thorax. A, bronchus, entering the lung; B, the aorta cut at its origin and again at the descending part of its arch; C, the pericardial space; D, the pleural cavity; E, the alimentary canal; PA, the pulmonary artery; X, the neural canal.” —Martin, 1917


H. Newell Martin, The Human Body (New York: Henry Holt and Company, 1917) 6


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