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Educational Statistics for Britain. Nature 199, 1138 (1963). https://doi.org/10.1038/1991138a0
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DOI: https://doi.org/10.1038/1991138a0
Nature volume 199, page 1138 (1963)
Educational Statistics for Britain. Nature 199, 1138 (1963). https://doi.org/10.1038/1991138a0
Issue Date:
DOI: https://doi.org/10.1038/1991138a0