00281nam a2200109Ia 4500008004100000020001800041082001500059100001500074245004100089260002800130300001300158190710s9999    xx            000 0 und d  a0-415-00539-6  a370.15 B56  aBlack, P J 0aChildren's informal ideas in science  aLondonbRoutledgec1993  axiii,244