00285nam a2200097Ia 4500008004100000082001700041100003300058245005300091260003400144300000900178140113s9999    xx            000 0 und d  a633.002   K7  a"Martin, J.H. & Leonard W H"  aPrinciples of field crops production 2nd edition  a1967bMacMillan Co.cNew York  a1044