Edited by H.B. Stoner, with the assistance of C.J. Threlfall. 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 L.S. Penrose with the assistance of Helen Lange Brown. edited by Dexter H. Howard, with the assistance of Lois F. Howard. edited by Annie M. Brewer, with the assistance of Marie Browne. edited by Thaddeus C. Trzyna with the assistance of Ilze M. Gotelli. edited by Susan L. Shirk with the assistance of Kevin Kennedy. edited by G. Shabbir Cheema with the assistance of Sandra E. Ward. Edited by Steven Rose with the assistance of David Pavett.