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008 160616s 000 0
245 _aThe earth and the its gravity field
100 _aHeiskanen, W.A.
100 _aMeinesz, F A Vening
500 _aB91:648 J8
942 _cBK
_2BK10223
080 _a523.5 HEI
999 _c10223
_d10223