00500cam a22001693 450000100070000000500170000700800410002401900120006503500110007703500110008804000180009924501020011726000640021930000100028350000170029398400200031063235620121214112642.0830427s1955 xx 000 0 eng d1 a2597393 9573231 a632356 aANLbengcANL04aThe Backward child /cMental Health Division, Department of National Health and Welfare, Canada. aOttawa :bDepartment of National Health and Welfare,c1955. a61 p. aCover title. aANLcE pam 3373