00308nam a2200121Ia 4500100001800000650001200018250000600030490000600036654003000042245006900072260003300141546001200174  aMc Graw Hill   aGeneral  a7  v2  aMc graw hill encyclopedia  aMc Graw  Hill  Circuit  Encyclopaedia   of Science  & technology  bMc Graw HillaNew yorkc1992  aENGLISH