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 81 (januar 1, 1981). Set august 5, 2020. https://tidsskrift.dk/geografisktidsskrift/article/view/45239.