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Beyond the Classroom. Nature 217, 698–699 (1968). https://doi.org/10.1038/217698b0
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DOI: https://doi.org/10.1038/217698b0
Nature volume 217, pages 698–699 (1968)
Beyond the Classroom. Nature 217, 698–699 (1968). https://doi.org/10.1038/217698b0
Issue Date:
DOI: https://doi.org/10.1038/217698b0