Advances in organic geochemistry 1968 / Proceedings of the 4th International........................................16-18 September, 1968 - Oxford: Pergamon Press, 1969 - 617p. - International series of monographs in earth science . Subjects--Topical Terms: Geochemistry Subjects--Index Terms: Hydrocarbons Universal Decimal Class. No.: 550.4:547(082.2) / K9