@book{ international1968iaea, title={Isotopes and Radiation in Soil Organic Matter Studies (Vienna, 15-19 July 1968)}, series={Proceedings Series}, year={1968}, isbn={92-0-010368-5}, url={http://www.dgdingfa.net/publications/2150/isotopes-and-radiation-in-soil-organic-matter-studies-vienna-15-19-july-1968}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }
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