00348nam a2200109Ia 4500082002500000100006100025245010600086260002200192300001400214500000500228700000500233  a331.1180182bC748.ML  aConference of "Labour Statisticians", Geneva, Sept. 1949  aMethods of labour productivity statistics; report prepared for the seventh international conferenceb  aGenevabILOc1951  aiv, 136p.  a  a