00340nam a2200133 a 450000500170000002000150001708200170003210000180004924500250006725000120009226000360010430000240014063000420016420251203110708.0  a8123909314  a553.282bLEV  aLevorsen  A.I  aGeology of petroleum  a2nd ed.  aNew DelhibCBS Publishersc1985  ax,724p.c24 cm.bPB  aPetroleum Products - Geological study