Balstrøm, T. (1990) “Landslides: Extent and economic significance: proceedings of the 28. International Geological Congress: Symposium on Landslides, Washington, D.C., 17July 1989. Ed. by Earl E. Brabb & Betty L. Harrod”., Geografisk Tidsskrift - Danish Journal of Geography, 90. Available at: https://tidsskrift.dk/geografisktidsskrift/article/view/44836 (Accessed: 7 December 2025).