00424ntaaa2200169 45000030003000000050017000030080021000200400037000410820017000781000026000952450027001212500010001482600047001583000010002056500016002157000023002310120251027202614.00714s1973 ag 01 aAR-BaBNbspacAR-BaBNeaacrdRIC a370.0000 B21 aBallesteros, Antonio aOrganización escolar a1 ed. aBuenos Aires : bEditorial Lozada, cc1952 a180 p aeducación aSáinz, Fernando