00278nam a2200109Ia 4500082002400000100002300024245006400047260003200111300001500143500000500158700000500163  a331.110973bL443.ME  aLebergett, Stanley  aManpower in economic growthbthe American record since 1900  aNew YorkbMcGraw-Hillc1964  axii, 561p.  a  a