00648nam a2200205Ia 450000500170000000800410001704000190005804100120007708200130008910000190010224500450012125000120016626000270017830000380020544000310024350400650027465000170033965100760035685000100043220220805142130.0131103s9999    xx            000 0 und d  aLoreto College  aEnglish  a552bSPO  aSpock , L . E.  aGuide to the study of rockscL. E. Spock  a2nd ed.  aNewYorkbHarper c1962  axv ,298pb ill. figures , tables   aHarper's geoscience series  aIncludes bibliographical refererences , appendices and index  aPetrology -   aPetrology - Properties , composition , analysis structures  of rocks -   aLCLIB