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024 _a48445
037 _cTextual
040 _aCSL
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_cCSL
041 _aeng
082 _aH42, L6
100 _aOpen University
245 0 _aEarth sciences topics and methods
260 _aWalton
_bHall Open University
_c1976
300 _a80p.
_ccm.
650 _a Earth
650 _aGeology
942 _hH42, L6
_cTEXL
_2CC
999 _c68220
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