Hansen, V. (1981) “Wilh. Abel: AGRICULTURAL FLUCTUATIONS IN EUROPE From the thirteenth to the twentieth centuries. London 1980, XII, 363 s., ill., 24 cm, £ 17.50. Methuen & Co. Ltd, Hants”., Geografisk Tidsskrift - Danish Journal of Geography, 81. Available at: https://tidsskrift.dk/geografisktidsskrift/article/view/45185 (Accessed: 6 December 2025).