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CLAYS AND CLAY MINERALS: PROCEEDINGS OF THE NINETH NATIONAL CONFERENCE ON CLAYS

By NATIONAL ACADEMY OF SCIENCES, NATIONAL RESEARCH COUNCIL. OXFORD Pergamon Press 1962 . 23X15

By NATIONAL ACADEMY OF SCIENCES, NATIONAL RESEARCH COUNCIL. OXFORD Pergamon Press 1963 . 23X15

By NATIONAL ACADEMY OF SCIENCES NATIONAL RESEARCH COUNCIL. N.A.S.N.R.C 1950