4906 20200610165505.0 CTALK-2020-0122 Clette, Frédéric The Sunspot Number database: progresses in data recovery and digitization 2019 2019-08-21 STCE Lefèvre, Laure Bechet, Sabrina ISSI Team Meeting 2, Recalibration of the Sunspot Number series, Bern, Switzerland frederic.clette@observatoire.be https://www.issibern.ch/teams/sunspotnoser/wp-content/uploads/2019/09/P4_11_Clette_SNdata.pdf Invited CTALKCONT