We would like to gratefully acknowledge the Canadian Department of Natural Resources for their contribution in funding background research, and also to thank David Boulter of the Canadian Department of Natural Resources, and Ilan Vertinsky and Mabel Yee of the University of British Columbia. We would like to express our gratitude to all those who provided helpful information, and guidance in obtaining information. Thanks are due to Marku Simula, Michael Hicks and Bill Mankin, who provided useful comments on the final draft of this report. Finally, we would especially like to thank Elisa Rubini who typed, checked and provided overall secretarial support in the preparation of the report.
NOTE: This study was first published in 1998. This version is essentially the same report, but some updating of data and text has been carried out where conditions have changed since the original publication was prepared.
