File:N. Johanna Kildahl (1868-1967) in Laboratory.jpg
![File:N. Johanna Kildahl (1868-1967) in Laboratory.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2c/N._Johanna_Kildahl_%281868-1967%29_in_Laboratory.jpg/732px-N._Johanna_Kildahl_%281868-1967%29_in_Laboratory.jpg?20200809182702)
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