Fristrup., B. (1961) “Nine Glacier Maps. American Geographical Society Special Publication No. 34. Northwestern North America. 1:10.000, med tekst. 1960. Pris 3s”., Geografisk Tidsskrift - Danish Journal of Geography, 60. Available at: https://tidsskrift.dk/geografisktidsskrift/article/view/46696 (Accessed: 7 December 2025).