000 00267nam a2200109Ia 4500
008 180612s9999||||xx |||||||||||||| ||und||
041 _aen
100 _aW.J.Duffin
245 0 _aElectricity and Magnetism
260 _aNewyork
_bMcgraw-Hill book co.
_c1980
942 _cPR
999 _c42523
_d42523