Fristrup, Børge. “Vivian C. Bushnell & Richard H. Ragle (eds.): Icefield Ranges Research Project. Scientific Results. Vol. 2”. Geografisk Tidsskrift - Danish Journal of Geography 73 (January 1, 1974). Accessed December 23, 2025. https://tidsskrift.dk/geografisktidsskrift/article/view/45713.