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Comparing A-Levels. Nature 218, 617–618 (1968). https://doi.org/10.1038/218617b0
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DOI: https://doi.org/10.1038/218617b0
Nature volume 218, pages 617–618 (1968)
Comparing A-Levels. Nature 218, 617–618 (1968). https://doi.org/10.1038/218617b0
Issue Date:
DOI: https://doi.org/10.1038/218617b0