1. A simple algorithm for simulating the solar ultraviolet radiation at the Earth's surface: An application in determining the minimum erythema dose

   • A. Katsambas
   • Ch. Andoniou
   • D. N. Asimakopoulos

   OriginalPaper Pages: 191 - 204

2. An analysis of the spectrophotometric and photometric observations of comets 1967II, 1968I, 1968V, and 1968VI

   • Amaury A. De Almeida

   OriginalPaper Pages: 205 - 216

3. Gravity studies of the Tharsis area on Mars

   • Peter Janle
   • Ercan Erkul

   OriginalPaper Pages: 217 - 232

4. Origin of the Archean Earth impactors

   • Kent D. Trego

   Letter to the Editor Pages: 233 - 235

5. Surface locations of potential aquifer ecosystem on Mars

   • Kent D. Trego

   Letter to the Editor Pages: 237 - 238

6. Bibliography

   Legacy Pages: 239 - 284