Mean Areas and Heliographic Latitudes of Sun-spots in the year 1899, deduced from Photographs taken at the Royal Observatory, Greenwich, at Dehra Dûn (India), and in Mauritius | Zendy

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Mean Areas and Heliographic Latitudes of Sun-spots in the year 1899, deduced from Photographs taken at the Royal Observatory, Greenwich, at Dehra Dûn (India), and in Mauritius

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