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Library of the U.S. Naval Observatory. Nature 191, 22 (1961). https://doi.org/10.1038/191022a0
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DOI: https://doi.org/10.1038/191022a0
Nature volume 191, page 22 (1961)
Library of the U.S. Naval Observatory. Nature 191, 22 (1961). https://doi.org/10.1038/191022a0
Issue Date:
DOI: https://doi.org/10.1038/191022a0