File:PSM - Entomologists-R. von Osten-Sacken.jpg
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![File:PSM - Entomologists-R. von Osten-Sacken.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/PSM_-_Entomologists-R._von_Osten-Sacken.jpg/312px-PSM_-_Entomologists-R._von_Osten-Sacken.jpg?20140803225117)
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