1. The approximate age of atmospheric ozone of the earth and altitudinal effect of nitric oxide on ozone

   • P. K. Jana
   • S. K. Midya

   OriginalPaper Pages: 141 - 145

2. Broad band filter colours and optical depth of the G and L impact sites of comet shoemaker-levy 9

   • M. A. Al Saud
   • A. A. Malawi
   • Y. M. Al-Mleaky

   OriginalPaper Pages: 147 - 155

3. The effect of solar parameters on seasonal variation of 5893 Å line intensity at Calcutta

   • S. K. Midya
   • G. Tarafdar
   • T. K. Das

   OriginalPaper Pages: 177 - 183

4. Rayleigh waves in an orthotropic thermoelastic medium under gravity field and initial stress

   • A. M. Abd-Alla
   • S. M. Ahmed

   OriginalPaper Pages: 185 - 197