ملف:Nitrogen Cycle Dutch text.jpg

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This image is a work of an Environmental Protection Agency employee, taken or made as part of that person's official duties. As works of the U.S. federal government, all EPA images are in the public domain in the United States. PD Public domain false false

04:22, 7 February 2005 . . Onco p53 (Talk | contribs) . . 475×370 (147,183 bytes) (Uploaded original, compressed looks crappy) 

(del) (rev) 22:35, 5 February 2005 . . Onco p53 (Talk | contribs) . . 475×370 (51,143 bytes) ((image of nitrogen cycle {{PD}} from the EPA)) (del) (rev) 19:25, 28 December 2004 . . Onco p53 (Talk | contribs) . . 333×259 (34,112 bytes) (image of nitrogen cycle {{PD}} from the EPA)