00416cam a22000977a 4500008004000000082001700040245014700057260005000204300001000254700005400264180718b1966   xxu||||| |||| 00| 0 eng d  aP463x42 Un3n  aNew Problems in school design: middle schools: implication of transfer at 12 or 13 yearscby Deprtment of Education and Science, United Nation  aLondonbHer Majesty's Stationery Officec1966  a143p.  aUnited Nation. Department of Educatin and Science