00498nam a2200181Ia 450000500170000000800410001704000190005804100120007708200130008910000190010224500480012126000340016930000390020350400190024265000170026165100280027885000100030620220805144115.0131103s9999    xx            000 0 und d  aLoreto College  aEnglish  a552bTYR  aTyrrell, G. W. 4aThe Principles of  petrologycG. W. Tyrrell  aLondonbMethuen and co.c1926  axii,349p.b ill.78 figures ,tables  aReprinted 1967  aPetrology -   aPetrology-principles -   aLCLIB