1. Editor's note

   EditorialNotes Pages: 149 - 149

2. On maximum likelihood estimation of parameters in incorrectly specified models of covariance for spatial data

   • A. J. Watkins
   • F. H. M. Al-Boutiahi

   Articles Pages: 151 - 173

3. Spatial simulation of geologic variables

   • Zekâi Sen

   Articles Pages: 175 - 188

4. Automatic delineation of drainage basins within digital elevation data using the topographic primal sketch

   • M. C. Zhang
   • J. B. Campbell
   • R. M. Haralick

   Articles Pages: 189 - 209

5. A note on John Playfair and the statistics of directional data

   • Nicholas J. Cox

   Articles Pages: 211 - 212

6. A review of lognormal estimators forin situ reserves

   • Jacques Rivoirard

   Teacher's Aid Pages: 213 - 221

7. Comment on “measures of variability for geological data” by D. F. Watson and G. M. Philip

   • John Aitchison

   Letter To The Editor Pages: 223 - 226

8. Reply to comment on “measures of variability for geological data” by D. F. Watson and G. M. Philip

   • D. F. Watson

   Letter To The Editor Pages: 227 - 231

9. Book review

   • Graeme Bonham-Carter

   BookReview Pages: 233 - 235