000 00299nam a2200121 4500
008 160616s 000 0
245 _aEarth's magnetism
100 _aChapman, Sydney
440 _aMethuens monographs on physical subjects
500 _aC75 K1
942 _cBK
_2BK8812
080 _a538 CHA
999 _c8812
_d8812