TY - BOOK AU - Ahrens, L. H. TI - ORIGIN AND DISTRUBUTION OF THE ELEMENTS U1 - 551.9 PY - 1968/// CY - Oxford PB - Pergamon Press KW - Geochemistry N1 - Internaional Symposium Cosponsored By Unesco And Ivgs And Held At The Headquarters Of Unesco In Paris In May 1967 ER -