00321nam a2200097Ia 4500008004100000040002500041082001600066100004200082245006600124260003300190230627s9999    xx            000 0 und d  aNORSU-SiacNORSU-Sia  a 372.13 H34  aHelm, Judy Harris, & Llilian G. Katz  0aYoung investigators : the project aproach in the early years   bTeachers College Pressc2001