Über Entwickelungsgeschichte der Thiere : Beobachtung und Reflexion / von Dr. Karl Ernst v. Baer.

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Über Entwickelungsgeschichte der Thiere : Beobachtung und Reflexion / von Dr. Karl Ernst v. Baer. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.