Irwin Unger ; with the assistance of Debi Unger. by Irwin Unger. With the assistance of Debi Unger. Irwin Unger ; portraits and documents by Debi Unger. David Mumford with the assistance of C. Musili. prepared with the assistance of Alan Evison. by John M. Cage, with the assistance of C. J. Bashe. Irwin Unger ; historical portraits and documents by Debi Unger. [by] Phillip Cutler with the assistance of Hardy Hoover. Mark A. Kishlansky ; with the assistance of Victor Stater. by George H. McKnight; with the assistance of Bert Emsley.