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Credit
Die chemische und mikroskopisch-bakteriologische Untersuchung des Wassers, zum Gebrauche für Chemiker, Ärzte, Medicinalbeamte, Pharmaceuten, Fabrikanten und Techniker / bearbeitet von F. Tiemann und A. Gärtner. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.