Lockhart, J A R Introduction to crop husbandry : including grassland / by J.A.R. Lockhart and A.J.L. Wiseman. - 6th ed. - Oxford : Pergamon Press, c1989. - xiii, 319 p. : ill. ; 24 cm. Includes bibliographical references and index. ISBN: 0029460379 Subjects--Topical Terms: Crops.Agriculture.Crops--Great Britain.Agriculture--Great Britain. LC Class. No.: SB98 / .L62 1988 Dewey Class. No.: 631/.0941