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Coal-Tips. Nature 212, 442 (1966). https://doi.org/10.1038/212442a0
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DOI: https://doi.org/10.1038/212442a0
Nature volume 212, page 442 (1966)
Coal-Tips. Nature 212, 442 (1966). https://doi.org/10.1038/212442a0
Issue Date:
DOI: https://doi.org/10.1038/212442a0