edited by David C. Roller and Robert W. Twyman edited by David E. Rowe and Robert Schulmann. edited by Marianne O. Nielsen and Robert A. Silverman edited by Paul E. Schellinger and Robert M. Salkin edited by Evelyn Brister and Robert Frodeman. edited by Mary E. Miller and Barbara E. Mundy edited by Sandra Spanier and Robert W. Trogdon. edited by Patrick Pardo and Robert Dean edited by Christy Desmet and Robert Sawyer edited by David Brauner and Axel Stahler