2448-7678 2448-7678 S2448-76782002000200002 Mexico 00 11 2002 00 11 2002 31 91

1994 1 1 1999 1986 XVI 3-4 3-4 1996 2 3 y 4 3 y 4 1976 1993 3° 3° 1967 1994 2000 1988 1996 OCDE 1991 1997 1990 16 16 1996 48 48 UNESCO 1996 UNESCO 1990 UNESCO OREALC 1996