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Credit
Die alte Grenzscheide zwischen Thier- und Pflanzenwelt und deren Umsturz durch die moderne Naturwissenschaft : eine anatomisch-physiologische Abhandlung / von Friedrich Karl Knauer. Public Domain Mark. Source: Wellcome Collection.
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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.