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This research was supported in part by the Air Force Cambridge Research Center, Geophysics Research Directorate, through Contract AF19(604)-146 with Harvard University.
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Menzel, D.H. Solar activity and cosmic radiation. Nuovo Cim 8 (Suppl 2), 214–217 (1958). https://doi.org/10.1007/BF02962525
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DOI: https://doi.org/10.1007/BF02962525