00281nam a2200097   450000100070000000500170000700800360002410000250006024500490008526400490013400213120260807101300.0260101s1964    pe      000 0 spa  d1 aUnión Panamericana10aEstudio Social de América Latina 1963-1964 1aWashington D. C.bUnión Panamericanac1964