00296nam a2200109Ia 4500082002100000100003800021245007600059260002800135300001300163500000500176700000500181  a607.273bUn58.SE  aU. S. Bureau of Labour Statistics  aScience and engineering in American industry; report on a 1956 surveyb  aWashingtonbUSGPOc1959  ax, 117p.  a  a