00257nam a2200097Ia 4500008004100000082003300041100002300074245003700097260001700134300000800151140113s9999    xx            000 0 und d  a"631.46""1967""(082.2)   L0"  a"Phillipson., Ed."  aMethods of study in soil ecology  a1970bUNESCO  a303