CHRISTIANSEN, S. Hans Ruthenberg: FARMING SYSTEMS IN THE TROPICS 3rd ed. Oxford 1980, XXII, 424 s., ill., 24 cm, paperback £ 12.50. Oxford University Press. Geografisk Tidsskrift, [S. l.], v. 81, 1981. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/45228. Acesso em: 19 apr. 2024.