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Start Over Collections Medicine in the Americas, 1610-1920 ✖Remove constraint Collections: Medicine in the Americas, 1610-1920 Subjects Labor Presentation ✖Remove constraint Subjects: Labor Presentation Titles A contribution to the mechanism of descent and flexion in vertex presentations ✖Remove constraint Titles: A contribution to the mechanism of descent and flexion in vertex presentations

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  • A contribution to the mechanism of descent and flexion in vertex presentations1