Digitization of sunspot drawings by Spörer made in 1861–1894

Publisher: John Wiley & Sons Inc

E-ISSN: 1521-3994|336|1|53-62

ISSN: 0004-6337

Source: ASTRONOMISCHE NACHRICHTEN, Vol.336, Iss.1, 2015-02, pp. : 53-62

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Abstract