The sunspot period / by H. Helm Clayton
Resource type: Ressourcentyp: BuchBookLanguage: English Series: Smithsonian Institution. Smithsonian miscellaneous collections ; 98,2 | Smithsonian Institution Press Smithsonian Institution Press publication ; 3526Publisher: Washington : Smithsonian Institution, 1939Description: 18 S. : Ill., graph. DarstOther title:- sun spot
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