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Credit
Boden und Grundwasser in ihren Beziehungen zu Cholera und Typhus : Erwiederung auf Rudolph Virchow's hygienische Studie Canalisation oder Abfuhr / von Max v. Pettenkofer. 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.