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Summary
Nitrogen Cycle
Copyright status
This image is a work of an Environmental Protection Agency employee, taken or made during the course of an employee's official duties. As works of the U.S. federal government, all EPA images are in the public domain.
Source
http://en.wikipedia.org/wiki/Image:Nitrogen_Cycle.jpg
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment |
current | 21:12, 4 October 2006 |  | 475 × 370 (144 KB) | Alex | Nitrogen Cycle |
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