Schlippe, Pierre de, 1904- Shifting cultivation in Africa : the Zande system of agriculture / Pierre de Schlippe - London : Routledge & Paul, [1956] - xxxi, 304 p. : ill., maps ; 23 cm. Includes bibliographical references (p. [245]-291) Subjects--Topical Terms: Agriculture--Africa, Central.Zande (African people) Dewey Class. No.: 630.966