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File:Aquarium Nitrogen Cycle.png

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Description Diagram of the nitrogen cycle in an aquarium. Drawn in Sodipodi by Ilmari Karonen, SVG original available at .
Date 20 October 2005
Source Own work
Author Users Eliashc, Ilmari Karonen on en.wikipedia
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中文: Image:Aquarium Nitrogen Cycle(zh).png

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