00263nam a2200109 a 450000500170000002000150001708200180003210000220005024500450007226000240011730000120014120251203091904.0  a2707117463  a370.905,bles  aLesourne, Jacques  aEducation Societe Les Defis de l an 2000  aLa Decouvertec1988  a356, 22