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A division of the aa indices into six classes based on the Ap index, 1868-1976
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1977
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Details:
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Personal Author:
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NOAA Program & Office:
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Content Notes:Joseph A. Sutorik, Cheryl M. Cruickshank.
"July 1977."
Includes bibliographical references (page 9).
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Rights Information:CC0 Public Domain
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Compliance:Library
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