Proceedings of the conference held at Stockholm, Sweden, August 12-16 ; arr. by CIPEA Comité international pour létude des argiles / Edited by I. Th. Rosenquis and P. Graff-Peterson. - Rosenquist, Ivan Thorale, 1916- ed.; Graff-Petersen, Paul, ed. (Symposium Publications Division, Pergamon Press ; [distributed by Macmillan], 1963)