A note on the sunspot and prominence records made by Angelo Secchi during the period 1871–1875Víctor M. S. Carrasco, José M. Nogales, José M. Vaquero, Theodosios Chatzistergos and Ilaria ErmolliJ. Space Weather Space Clim., 11 (2021) 51DOI: https://doi.org/10.1051/swsc/2021033
