00260nam a2200097Ia 4500008004100000082002000041100002400061245003400085260003500119300000800154140113s9999    xx            000 0 und d  a631(02)   K6.18  a"Norman, A.G., Ed."  aAdvances in Agronomy -vol. 18  a1966bAcademic PresscNew York  a392