File:Ernest Ladrey, Observatoire De Paris, about 1875.jpg
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![File:Ernest Ladrey, Observatoire De Paris, about 1875.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Ernest_Ladrey%2C_Observatoire_De_Paris%2C_about_1875.jpg/800px-Ernest_Ladrey%2C_Observatoire_De_Paris%2C_about_1875.jpg?20180311084257)
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