Hansen, Kaj. “W.K. Hamblin, J.D. Howard: , EXERCISES IN PHYSICAL GEOLOGY 5. Ed. Minneapolis, Minn. 1980, VII, 225 s., ill., 28 Cm, Instructor’s Supplement IV, 68 s., Ill. Paperback $ 9.95. Feffer and Simons Education Division, Sussex”. Geografisk Tidsskrift - Danish Journal of Geography 81 (January 1, 1981). Accessed December 7, 2025. https://tidsskrift.dk/geografisktidsskrift/article/view/45239.