00254nam a2200097Ia 4500008004100000082002200041100001800063245003000081260003700111300000800148140113s9999    xx            000 0 und d  a631.45.631.8   K7  a"Cooke, G.W."  aControl of soil fertility  a1967bE.L.B.S. & Crosby cLondon  a526