Ferroelectrics for Optics: Physics and Chemistry of Crystalline Lithium Niobate . A. M. Prokhorov and Yu S. Kuz'minov. Hilger, New York, 1990. xx, 377 pp., illus. $130. Hilger Series on Optics and Optoelectronics. Translated from the Russian by T. M. Pyankova and O. A. Zilbert.