Hearl,Eeady O. creator Dillon John L. text NewDelhi KalyiPublishers c1988 monographic vii,667p.; Ill. Earl O.Heardy and John L.Dillon Includes bibliographic references and index. Agriculture Production agriculture Functions S494,5.P75 .H42 1988 8170961297 UOEL 000 20150325112451.0