Wessel, M. Fertilizer requirements of cacao (Theobroma cacao L.) in south-western Nigeria / M. Wessel - Amsterdam : RTI , 1971 - vii, 104p. : ill. ; 22 cm. - Communication of the Department of Agricultural Research . Includes bibliographical references. Subjects--Topical Terms: Fertilizers--NigeriaCacaoFertilizer requirements Dewey Class. No.: 631.8 / WES