De Waard, P.W.F. Foliar diagnosis, nutrition and yield stability of black pepper (piper nigrum L) in Sarawak / P.W.F. De Waard - Amsterdam : RTI , 1968 - xi, 148p. : ill. ; 24 cm. - DAR communication . Includes bibliographical references and index. Subjects--Topical Terms: Spices Dewey Class. No.: 633.83 / DEW