1. The Orbiting Geophysical Observatories

   • George H. Ludwig

   OriginalPaper Pages: 175 - 218

2. Application of the restricted problem of three bodies to space mechanics

   • V. Szebehely

   OriginalPaper Pages: 219 - 249

3. Optical tracking of artificial satellites

   • George Veis

   OriginalPaper Pages: 250 - 296

4. The role of soil science in space exploration

   • Roy E. Cameron

   OriginalPaper Pages: 297 - 312