00509nam a2200145Ia 4500008004100000040001700041082002500058100002700083110002800110245009600138260003300234300000900267440003300276650005400309190327s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta372.241bW927P  aCalclough, Christophen  aWorld Bank (Washington) 0aPrimary schooling and economic developmentba review of the evidencecChristophen Calclough  aWashingtonbWorld Bankc1980  a32p.  aStaff working paper; no. 399  aEducation-Economic aspects; Education, elementary