File:Jacob Christensen (1857–1917).jpg
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![File:Jacob Christensen (1857–1917).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Jacob_Christensen_%281857%E2%80%931917%29.jpg/384px-Jacob_Christensen_%281857%E2%80%931917%29.jpg?20210802095041)
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