00277nam a2200121Ia 4500082002000000100004000020245003300060250000900093260002800102300001500130500000500145700000500150  a658.52bIn61.IW  aInternational Labour Office, Geneva  aIntroduction to work studyb  a3rd.  aGenevabThe Auth.c1979  axiv, 442p.  a  a