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• File:Ammoniakproduktion.svg licensed with PD-self
  • 2009-08-09T14:07:11Z Orci 529x396 (42655 Bytes) Rahmen entfernt, Liniendicke etc.
  • 2009-08-09T14:01:25Z Orci 529x396 (44179 Bytes) {{Information |Description={{en|1=production of ammonia 1946-2007}} {{de|1=Ammoniakproduktion 1946-2007}} |Source=Eigenes Werk (own work), data from [http://minerals.usgs.gov/ds/2005/140/nitrogen.pdf usgs-nitrogen (fixed)-Amm

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