The Third International Conference on Permafrost, which was held in the Edmonton Plaza Hotel, Edmonton, Canada, July 10-13, 1978, was sponsored by the National Research Council of Canada. Roger J. E. Brown served as Chairman of the Organizing Committee. The Proceedings list 452 registrants, and Chinese scientists attended for the first time. The Conference consisted of special plenary sessions, technical papers sessions and poster sessions. The special plenary sessions were devoted to reviewing eight different topics.