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Preuß, E., Meyer von Freyhold, O.: Naturwissenschaften55, 177 (1968).
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Preuss, E. Verschleppte Tektite in Liberia. Naturwissenschaften 56, 512 (1969). https://doi.org/10.1007/BF00601969
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DOI: https://doi.org/10.1007/BF00601969