Eleventh Symposium (International) on Combustion. Published by the Combustion Institute, 1967. 1200 pp. $42.00. Fifth Symposium on Naval Hydrodynamics: Ship Motions and Drag Reduction. Office of Naval Research, 1964. 1170 pp. $7.25. Quantum Field Theory and Hydrodynamics . Edited by D. V. S KOBEL'TSYN . Consultants Bureau, Plenum Publishing Corporation, 1967. 283 pp. $7.50. Heat and Mass Transfer in Process Metallurgy . Edited by A. W. D. Hills. Published by The Institution of Mining and Metallurgy, 1967. 252 pp. £3. Atmospheric Turbulence and Radio-wave Propagation . Edited by A. M. Y AGLOM and V. I. T ATARSKY . Publishing House Nauka, 1967. 374 pp. 2.25 roubles.