1. Velocity dispersion in particulate disks with size distribution

   • J. Lukkari

   OriginalPaper Pages: 207 - 218

2. Divergent plate boundary characteristics and crustal spreading in Aphrodite Terra, Venus: A test of some predictions

   • James W. Head
   • L. S. Crumpler

   OriginalPaper Pages: 219 - 231

3. Spectrophotometry of comet Hartley-Good (1985l)

   • B. S. Rautela
   • P. S. Goraya
   • S. K. Gupta

   OriginalPaper Pages: 233 - 242

4. Spectrophotometry of P/Halley (1982i)

   • P. S. Goraya
   • B. B. Sanwal
   • J. S. Malhi

   OriginalPaper Pages: 243 - 249

5. Cometary collisions and the dark material on Iapetus

   • Ronald G. Tabak
   • Warren M. Young

   OriginalPaper Pages: 251 - 264

6. Contractions of subsolar nebulae

   • J. J. Rawal

   OriginalPaper Pages: 265 - 274

7. Application of Hori technique in general planetary theory

   • Osman M. Kamel

   OriginalPaper Pages: 275 - 289

8. The visual brightness behaviour of P/Halley during 1982–1986

   • P. S. Goraya
   • R. V. Biju
   • J. S. Malhi

   Letter to the Editor Pages: 291 - 293

9. Planetary distance law

   • J. J. Rawal

   Letter to the Editor Pages: 295 - 296