1. A new design concept for arch dams taking into account seepage forces

   • K. Gell
   • W. Wittke

   Original Papers Pages: 187 - 204

2. Evaluation of rock classifications at B. C. Rail tumbler ridge tunnels

   • Peter K. Kaiser
   • C. MacKay
   • A. D. Gale

   Original Papers Pages: 205 - 234

3. Response of dry- and liquid-filled porous rocks to static and dynamic loading by variously-shaped projectiles

   • C. O. Rogers
   • S. -S. Pang
   • W. Goldsmith

   Original Papers Pages: 235 - 260

4. On the modes of instability of a rigid block on an inclined plane

   • C. Sagaseta

   Technical Note Pages: 261 - 266

5. Book review

   • E. G. Prater

   BookReview Pages: 267 - 268

6. Announcements

   Announcement Pages: 269 - 269