00285nam a2200109Ia 4500008004100000041000800041082002400049100001500073245004900088260003100137300000700168211209s1971    xx            000 0 und d  aeng  a621.381 N71 ROB/KNE  aROBERT M B  a49 EASY ENTERTAINMENTS AND SCIENCE PROJECTS   bTARAPOREVAL AND SONSc1971  a96