A study of the plages and sunspot groups observed during the Retrospective world intervals for 1964 ; The solar and geomagnetic activity observed during the IQSY Retrospective world interval for 1965 / Maria Cristina Ballario.
Pubblicazione:
Firenze : Tip. Baccini & Chiappi, 1967.
Descrizione fisica:
16 p.
Note:
Estr. da: IQSY notes, n. 17 e 18 (1966)
Altri titoli:
The solar and geomagnetic activity observed during the IQSY Retrospective world interval for 1965.
