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GEOLOGICAL STUDY AND PRELIMINARY EVALUATION OF POTENTIAL RESERVES OF HEAVY OIL OF THE ORINOCO TAR BELT EASTERN VENEZUELAN BASIN.GALAVIS JA; VELARDE CH HM.1967; 7TH.WORLD.PETROL.CONGR.MEXICO.67.PROC.3.BARKING.ESSEX.ELSEVIER.PUBL.CO; 1967, P. 229 A 234Miscellaneous