00308nam a2200097Ia 4500008004100000082001700041100005100058245003500109260005100144300001500195260218b        |||||||| |||| 00| 0 eng d  a331bN277.AL  aNational Bureau of Economic Research, New York  aAspects of labour economicsb/  aNew Jersey:bPrinceton University Press,c1962  axii, 349p.