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Credit
Lettre sur la formation de l'oeuf dans l'espéce humaine et dans les mammifères / par Ch. Ern. de Baer ; publiée par G. Breschet. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.