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This paper represents results of research carried out by the University of California under contract with the U.S. Atomic Energy Commission.
We appreciate the help of Ranger Campbell of the U.S. Forestry Service at King City in securing the investigated tree sample. Thanks are due to Dr. S.Epstein and Mrs.Irene Vidzuinas for the mass spectroscopic C13 determinations. We also wish to thank Drs.MÜnnich andVogel for sending us their manuscript prior to its publication.
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Bien, G.S., Suess, H.E. Increase of C14 in the atmosphere from artificial sources measured in a California tree. Z. Physik 154, 172–174 (1959). https://doi.org/10.1007/BF01338373
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DOI: https://doi.org/10.1007/BF01338373