Mean Areas and Heliographic Latitudes of Sun-spots in the year 1897, 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 1897, deduced from Photographs taken at the Royal Observatory, Greenwich; at Dehra Dûn (India); and in Mauritius

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