The editors are grateful for the editing and production assistance of a number of IDA staff members, especially Sylvia Horowitz, who copyedited the entire manuscript and supervised its transformation for computer-generated typesetting. Vivian Carlip gave a second editorial reading, Cecily O'Neil helped with production, the manuscript was proofread by Vera Beers-Tyler, and Peter Daly designed the map on the following page. To the contributors, of course, goes our greatest appreciation, for their gracious cooperation in making requested revisions as well as for the content of their work.