Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'IngénieurOctober 1988, Volume 38, Issue 1, pp 155–159 | Cite asForthcoming eventsArticle 20 Downloads This is a preview of subscription content, log in to check access.PreviewUnable to display preview. Download preview PDF.Unable to display preview. Download preview PDF.Copyright information© International Assocaition of Engineering Geology 1988