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Astronomy is Fun. Nature 219, 433–434 (1968). https://doi.org/10.1038/219433a0
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DOI: https://doi.org/10.1038/219433a0
Nature volume 219, pages 433–434 (1968)
Astronomy is Fun. Nature 219, 433–434 (1968). https://doi.org/10.1038/219433a0
Issue Date:
DOI: https://doi.org/10.1038/219433a0