000 00307nam a2200145Ia 4500
100 _aLANGN J.G
020 _a3-8009-4007-8
650 _amagnetic field
365 _cRS
365 _d1
942 _cDENGBK
245 _aThe magnetic field
260 _bHeydon & Son Ltd.,
_c1978
_aLondon
300 _a67pp
999 _c24689
_d24689