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Opera Aestuarii
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Opera Aestuarii (Batavice Deltawerken) sunt constructiones defensionis contra inundationes maris ad aestuarium fluminum Rheni et Mosae in Nederlandia.
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Oosterscheldekering-pohled.jpg/640px-Oosterscheldekering-pohled.jpg)
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Opera Aestuarii (Batavice Deltawerken) sunt constructiones defensionis contra inundationes maris ad aestuarium fluminum Rheni et Mosae in Nederlandia.