Spectrographic determination of boron in
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Article
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1946
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Elsevier Science
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English
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~eonlagnetic storms were reported by"the Cheltenham, Md., magnetic observatory on March 4 to 6, March 9, and March IO to r I ; the last was the most severe, but the disturbance was much less severe than the one that accompanied the original sunspot group. Daily warnings of radio propagation disturb