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- Beschreibung:
- Photograph of Robert Koch, who demonstrated the bacterial causes of many specific diseases. Koch received the Nobel Prize in 1905.
- Datum erstellt:
- undated
- Beschreibung:
- Photograph of William H. Welch. Note on verso: “‘Our Popsy’ 1906 Prof. of Pathology and Bacteriology.”
- Datum erstellt:
- 1906