Solar Observations by Angelo Secchi. I. Di- gitization of Original Documents and Analysis of Group Numbers over the Period of 1853-1878

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Authors: Ermolli, I. et al.

Journal title: The Astrophysical Journal Supplement Series

Journal number: 269

Journal publisher: University of Chicago Press

Published year: 2023

DOI identifier: 10.3847/1538-4365/ad0886

ISSN: 0067-0049