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         This is a file from the  Wikimedia Commons. The description on its  description page there is shown below. | 
        
        
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       en:
        - Description: A composite of images showing the diminishing  en:Lake Chad from 1973 to 2001.
 - Info: The large image is a composite of photos taken with  en:Landsat-7. Images courtesy NASA GSFC Scientific Visualization Studio and Landsat 7 Project Science Office.
 - Source: earth observatory  (file)
 - License: Public domain 
       
 
       de:
        - Beschreibung: Der  de:Tschadsee schrumpft langfristig. Das Bild zeigt den See im Jahr 1973, 1978, 1997 und 2001 aus der Erdumlaufbahn. Die offene Wasserfläche ist im Falschfarbeninfrarotbild blaugrün wiedergegeben.
 - Quelle: Adapted from NASA images at  http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=4714 (aus der englischen Wikipedia)
 - Lizenzstatus: Public Domain
 
       
 License
       
        
         
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         This file is in the  public domain because it was created by  NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". ( NASA copyright policy page or  JPL Image Use Policy). Warnings: 
           - Use of  NASA logos (which include the current "meatball" logo, the old "worm" logo, and the seal) is restricted.
 - The NASA website hosts a large number of images from the  Soviet/ Russian space agency, and other non-American space agencies. These are not in the public domain.
 - Materials from the  Hubble Space Telescope may be copyrighted if they do not explicitly come from the  STScI. 
 - All materials created by the  SOHO probe are copyrighted and require permission for commercial non-educational use. 
 - Images featured on the  Astronomy Picture of the Day (APOD) web site may be copyrighted. 
  
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The following pages on the English Wikipedia link to this file (pages on other projects are not listed):