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          The Global Network of Isotopes in Rivers (GNIR) was initiated in 2002 to complement the Global Network of Isotopes in Precipitation (GNIP). GNIR is a global environmental observation programme dedicated to the compilation of isotopic assays of river waters, but also to the ongoing collection and analysis of water samples.
          
    
    
    
  
          

          
  
      
  
  
          
    
            
          

  
  
          

          
                  
          
  
  
  
  
  
  
          


          
  
          
      
          
    
          
  
          






  
          
    
          
      
          
          
          
    
          

      
    
          
    
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