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            These books are included in Project Gutenberg. They are archived and can be improved at GITenberg.
        
        
        
        
        
keyword: attenuation coefficient – 0 free books.
         These books are included in Project Gutenberg. They are archived and can be improved at GITenberg.
        
            These books are included in Project Gutenberg. They are archived and can be improved at GITenberg.