1. Orbital stability of massive protoplanets in the terrestrial planet region of the solar system

   • J. R. Donnison
   • I. P. Williams

   OriginalPaper Pages: 421 - 424

2. The ramsey phase-change hypothesis

   • R. A. Lyttleton

   OriginalPaper Pages: 425 - 442

3. Protoplanetary core formation by rain-out of iron drops

   • Wayne L. Slattery

   OriginalPaper Pages: 443 - 456

4. Tectonic pattern of mare ridges of the letronne-montes riphaeus region of the Moon

   • J. Raitala

   OriginalPaper Pages: 457 - 477

5. Crater size-shape profiles for the moon and mercury: Terrain effects and interplanetary comparisons

   • Eugene I. Smith
   • Jill A. Hartnell

   OriginalPaper Pages: 479 - 511

6. Structures and activity of a lunar tectonic zone

   • J. Raitala

   OriginalPaper Pages: 513 - 517