1. Electron precipitation in the auroral zone

   • R. R. Brown

   OriginalPaper Pages: 311 - 387

2. Optical observations of solar flares

   • ZdenĚk švestka

   OriginalPaper Pages: 388 - 418

3. The detectability of molecular hydrogen in interstellar space

   • Carlos M. Varsavsky

   OriginalPaper Pages: 419 - 434

4. Book reviews

   • H. G. Van Bueren
   • J. Van Diggelen

   BookReview Pages: 435 - 436