1. Probable evidence for periodicities in global seismic energy release

   • Ioannis Liritzis
   • Theodoros M. Tsapanos

   OriginalPaper Pages: 93 - 108

2. Stratospheric ozone variations in the northern and the southern hemisphere during the period 1957–1990

   • John Xanthakis
   • Constantine Poulakos
   • Christos S. Zerefos

   OriginalPaper Pages: 109 - 125

3. Newtonian and post-newtonian tidal theory: Variable G and earthquakes

   • D. D. Dionysiou
   • E. N. Sarris
   • G. A. Papadopoulos

   OriginalPaper Pages: 127 - 140

4. The construction of a seventh-order Jupiter-Saturn analytical theory

   • Osman M. Kamel
   • Adel S. Soliman

   OriginalPaper Pages: 141 - 175

5. Registration of minute variations of the gravitational potential first derivative

   • A. P. Trofimenko

   Letter to the Editor Pages: 177 - 179

6. Porosity of the primal regolith of Mars and implications for the origin of runoff channels and the state of the paleoclimate

   • Kent D. Trego

   Letter to the Editor Pages: 181 - 182