The Periodoscope: with its Application to Obstetric Calculations, and the Periodicities of the SexProv Med Surg J 1848; s1-12 doi: https://doi.org/10.1136/bmj.s1-12.23.636-a (Published 15 November 1848) Cite this as: Prov Med Surg J 1848;s1-12:636
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