000 00293nam a2200121Ia 4500
008 210901s1972 xx 000 0 eng d
082 _a530 BLA
245 0 _aPhysics Magnetic fields
260 _aEngland
_bPenguin Books ltd
_c1971
300 _a133p.
650 _aPhysics
942 _2ddc
_cBK
999 _c11180
_d11180