00382nam a2200121Ia 4500082002200000100004900022245008700071260003200158300001400190490004600204500000500250700000500255  a658.9653bUn58.SA  aUnited States. Labor Statistics, Bureau of-.  aStudies of automatic technology; a case study of a modernized petroleum refineryb  aWashingtonbThe Auth.c1956  aiii, 44p.  aBureau of Labor Statistics report No. 120  a  a