The sunspot period (with one plate)
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Clayton, Henry Helm. 1939. "<a href="https://repository.si.edu/handle/10088/23675">The sunspot period (with one plate)</a>." <em>Smithsonian Miscellaneous Collections</em>, 98, (2) 1–18.
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Except where otherwised noted, this item's license is described as NO COPYRIGHT - UNITED STATES