by George H. McKnight; with the assistance of Bert Emsley. by John M. Cage, with the assistance of C. J. Bashe. by Mary K. Biagini with the assistance of Judith Hartzler. by Irwin Unger. With the assistance of Debi Unger. James M. McCrimmon, with the assistance of Webb Salmon. editor, R. Briggs with the assistance of G.A. Book Edited by M. Reiner, with the assistance of A. G. Ward. Irwin Unger ; with the assistance of Debi Unger. U. Tietze, Ch. Schenk, with the assistance of E. Schmid. A. S. Hornby, with the assistance of Christina Ruse.