edited by G. Shabbir Cheema with the assistance of Sandra E. Ward. edited by S. D. Lee, with the assistance of Bruce Peirano. edited by J. O'M. Bockris, with the assistance of B. E. Conway. edited by Annie M. Brewer, with the assistance of Marie Browne. edited by Dexter H. Howard, with the assistance of Lois F. Howard. edited by Susan L. Shirk with the assistance of Kevin Kennedy. edited by L. Mackenzie Miall, with the assistance of many expert chemists. Edited by Steven Rose with the assistance of David Pavett. edited by L.S. Penrose with the assistance of Helen Lange Brown. edited by Leo A. Orleans, with the assistance of Caroline Davidson.