Note: The Italian Science Fiction Book Club issued in the period 1963-1966 three series of books, each series with their own separate numbering. Series I, II, and series III. In the period 1970-1974 were more books issued, the numbering started after the total number of the first three series. This numbering continued for the next series of books, in the period 1976-1979. See the Italian website for the odd numbering system.