00647cam a2200217 a 45000010008000000030008000080050017000160080041000330100017000740200026000910400027001170500023001440820019001671000041001862450060002272600034002873000036003213650015003575040039003726500018004113790734BD-DhUL20140925120033.0840208s1984    enka     b    001 0 eng    a   84115850   a0852744420 :c£19.95  aDLCcDLCdDLCdBD-DhUL00aQC815.2b.J33 198400a538.7219bJAR1 aJacobs, J. A.q(John Arthur),d1916-10aReversals of the Earth's magnetic field /cJ.A. Jacobs.  aBristol :bA. Hilger,cc1984.  a(vii), 230 p. :bill. ;c24 cm.  aGBPb22.50  aIncludes bibliographies and index. 0aGeomagnetism.