Clays and clay minerals, vol. 9 : proceedings of the ninth National Conference on Clays and Clay Minerals, Lafayette, Indiana, October 5-8,1960 / Ada Swineford, editor Clay Congresses. TN941 .N3 549.6 NAC Includes bibliographical references and index. Oxford ; London : Pergamon Press, 1960. 1960. 1966 Text v. : eng International series of monographs on earth science ; no. 11 California. Division of Mines. Bulletin 169. [from old catalog] National Research Council (U.S.). Publication 327 [etc.]