SURVEY OF EXPERT OPINION ON PERMAFROST AND GEOTECHNICAL ISSUES FOR NORTHERN PIPELINES Geological Survey of Canada Open File Report 4734 By D.E. Lawrence This open file report is provided in the file "Open file 4734.pdf". Adobe Acrobat reader is required to view the PDF file and is available free from http://www.adobe.com/ The following citation should be used when referring to this report: Lawrence, D.E. 2004. Survey of expert opinion on permafrost and geotechnical issues for northern pipelines, Geological Survey of Canada Open File 4734, 22 p. Contact for correspondence: Margo Burgess Geological Survey of Canada, Natural Resources Canada 601 Booth Street Ottawa, Ontario K1A 0E8