Articles | Volume 18, issue 11 
            
                
                    
            
            
            
        https://doi.org/10.5194/bg-18-3505-2021
                    © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
                Geographic variability in freshwater methane hydrogen isotope ratios and its implications for global isotopic source signatures
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