File:Johann Josef von Wilczek (1738–1819) crop.jpg
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![File:Johann Josef von Wilczek (1738–1819) crop.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Johann_Josef_von_Wilczek_%281738%E2%80%931819%29_crop.jpg/385px-Johann_Josef_von_Wilczek_%281738%E2%80%931819%29_crop.jpg?20210715143531)
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