Ruthenberg, Hans Farming systems in the tropics = Hệ thống canh tác ở vùng nhiệt đới Hans Ruthenberg - 3 ed. - Britain Clarendo Press 1980 - 424p. 23cm. Referrences: P397 - 414 Subjects--Topical Terms: Tropics Subjects--Index Terms: Systems Tropics Collecting Cultivation Charactericti Dewey Class. No.: 631.2 / F