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Face presentation, mento-posterior

(Source: Smellie W. A set of anatomical tables, with explanations, and an abridgement of the practice of midwifery, with a view to illustrate a treatise on that subject, and collection of cases. Worcester, MA: Isaiah Thomas, 1793. Plate 25. Courtesy of Wikimedia Commons. Edited by Douglas Lanska. Public domain.)

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