Sunspot number series: latest update
World Data Center for the production, preservation and dissemination of the international sunspot number
SILSO
The Locarno station just completed a 5 year digitization project
The Specola Solare Ticinese, which is the pilot station of the SILSO network, completed a 5 years project for the digitization and safe archiving of the sunspot observations and data collected at the Specola Solare Ticinese in Locarno : https://doi.org/10.5281/zenodo.8117331.
In addition, SST and IRSOL (https://www.irsol.usi.ch/?noredirect=en_US) also developed an interactive WEB interface to look at these
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