Clays and clay minerals : proceedings of the sixth National conference on clays and clay minerals, University of California, Berkeley, California, August 19-23, 1957
– SWINEFORD, Ada, ed. – Clays and clay minerals : proceedings of the sixth National conference on clays and clay minerals, University of California, Berkeley, California, August 19-23, 1957. London [etc.]: Pergamon, 1959. X, 411 p. (International series of monographs in earth sciences. 2)