000 00251nam a22001217a 4500
082 _a677 NOR'F
100 _aNORTON, F. H
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245 _aREFRACTORIES
250 _a4TH
260 _aNEWYORK
_bMCGRAW HILL
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300 _a450P
942 _cBK
999 _c585296
_d585296