1. Magnetic storms and associated phenomena

   • K. D. Cole

   OriginalPaper Pages: 699 - 770

2. Ionospheric absorption of cosmic radio noise

   • Bengt Hultqvist

   OriginalPaper Pages: 771 - 817

3. The earth gravitational potential derived from satellite motion

   • Yoshihide Kozai

   OriginalPaper Pages: 818 - 879

4. Book reviews

   • J. F. Besseling
   • G. J. Bruins
   • C. H. van der Linden

   BookReview Pages: 880 - 882