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2. 1789 L'Art des Accouchemens. T. 1, p. 42. Desprez and Méquignon, Paris.
3. 1828 A compendious system of midwifery. Third edition, p. 28. Carey, Lea & Carey, Philadelphia.
4. 1866 The principles and practice of obstetrics. Henry C. Lea, Philadelphia.
5. 1933 The pelvis in obstetrics. Paul B. Hoeber, New York.