1. Editorial

   • C. de Jager

   EditorialNotes Pages: 135 - 135

2. Report on Lunar Nomenclature by the Working Group of Commission 17 of The IAU

   • D. H. Menzel
   • M. Minnaert
   • B. Bell

   Report Pages: 136 - 186

3. The interplanetary medium and its interaction with the Earth's magnetosphere

   • J. V. Kovalevsky

   OriginalPaper Pages: 187 - 257

4. Book reviews

   • William M. Kaula
   • J. Kleczek

   BookReview Pages: 258 - 258

5. Errata

   Erratum Pages: 258 - 258