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040 _aMAIN
041 _aEnglish
082 _a552
_bSPO
100 _aSpock, L. E.
245 _aGuide to the study of rocks
250 _a2nd ed.
260 _aNew York
_bHarper and row, publishers
_c1953
300 _axvi,256p.
650 _aGeology
650 _aRock
942 _cBK
999 _c30299
_d30299