Lockhart, J. A. R. Introduction to crop husbandry : including grassland / by J.A.R. Lockhart and A.J.L. Wiseman. - 6th ed. - Oxford, England ; New York : Pergamon, c1988. - xiii, 319 p. : ill. ; ISBN: 0080342019 : 0080342000 (pbk.) : 9780080342016 9780080342009 Subjects--Topical Terms: Crops.Agriculture.CropsAgriculture LC Class. No.: SB98.L64 1988