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1by Lange, Isabelle, Forbush, Scott E., 1904-, Carnegie Institution of Washington. Dept. of Terrestrial MagnetismSubjects: “...Cheltenham...”
Published 1948
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2by Carnegie Institution of Washington. Department of Terrestrial Magnetism., Forbush, Scott E., 1904-, Carnegie Institution of Washington.Subjects: “...Cheltenham...”
Published 1948
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