00270nam a2200097Ia 450000500170000000800410001710000350005824500320009326000390012530000080016420260413100639.0230516s9999||||xx |||||||||||||| ||und||  aRichter H.P & Schwanwcreighton 0aPractical Electrical Wiring  bN York Mcgrew Hill pub comp.c1990  a645