Similar Items

• Solar activity prediction/
  Published: (1971)
• Solar activity observations and predictions
  Published: (1972)
• The different indices of solar activity and the time of rise
  by: Ξανθάκης, Ιωάννης Ν. (1904- )
  Published: (1967)
• The different indices of solar activity and the time of rise
  by: Ξανθάκης, Ιωάννης Ν. (1904- )
  Published: (1967)
• Solar activity and earth's climate/
  by: Benestad, Rasmus E., 1968-
  Published: (2006)