File:PSM V81 D416 The new allegheny observatory.png
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![File:PSM V81 D416 The new allegheny observatory.png](https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/PSM_V81_D416_The_new_allegheny_observatory.png/800px-PSM_V81_D416_The_new_allegheny_observatory.png?20120810091118)
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