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Credit
Beiträge zur Kenntniss der Funktion der Atrioventrikular-Klappen des Herzens, der Entstehung der Töne und Geräusche in demselben und deren Deutung / von Victor Julius Nega. 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.