prepared with the assistance of Alan Evison. Edited by M. Reiner, with the assistance of A. G. Ward. by John M. Cage, with the assistance of C. J. Bashe. David Mumford with the assistance of C. Musili. Alvin S. Goodman ; with the assistance of David C. Major ... Irwin Unger ; with the assistance of Debi Unger. William I. Salmon with the assistance of Edward L. Salmon.