Origin and distribution of the elements / editor: L. H. Ahrens ; co-editors: A.G.W. Cameron ... [et al]. Ahrens, L. H. (Louis Herman), 1918- Unesco. International Union of Geological Sciences. Geochemistry Congresses. Cosmochemistry Congresses. QE515 .S94 1967 551.5 19 AHO Papers in English, French, or German. International symposium, held at Unesco Headquarters, Paris, 8-11 May 1967 ; co-sponsored by Unesco and the International Union of Geological Sciences. Includes bibliographies. Oxford ; New York : Pergamon Press, 1968. 1968. 1968 Text xvii, 1178 p. : eng engfreger International series of monographs in earth sciences, v. 30 International series of monographs on earth sciences ; v. 30.