Strach’s collection Notebook 1 Notebook 2 Notebook 3 Notebook 4 Notebook 5 Notebook 6 Notebook 7 Notebook 8 Notebook 9 Notebook 10 Notebook 11 Notebook 12 Notebook 13 Notebook 14 Notebook 15-55
Historical Archive of Sunspot ObservationsHistorical Archive of Sunspot Observations