1. Editorial

   • A. G. W. Cameron
   • Z. Kopal
   • M. D. Moutsoulas

   EditorialNotes Pages: 111 - 111

2. A second order Jupiter-Saturn planetary theory

   • Osman M. Kamel
   • Abdel Aziz Bakry

   OriginalPaper Pages: 113 - 123

3. The effect of orbital element variations on the mean seasonal daily insolation on Mars

   • E. Van Hemelrijck

   OriginalPaper Pages: 125 - 136

4. The interiors of the giant planets — 1983

   • R. Smoluchowski

   OriginalPaper Pages: 137 - 154

5. The Martian paleoenvironment and the evolution of macroorganisms

   • Kent D. Trego

   Letter to the Editor Pages: 155 - 155

6. Bibliography

   • Z. Kopal
   • M. Moutsoulas
   • F. B. Waranius

   Legacy Pages: 157 - 211