Mohammad Najafi ; with contributions by Sanjiv Gokhale. Sheana Bull ; with contributions by Mary McFarlane. Arthur H. Nilson ; with contributions by David Darwin. Frank K. Reilly ; with contributions by Don M. Chance. Stephen Marshak ; with contributions by Donald Prothero. William P. Ziemer ; with contributions by Monica Torres. Joel E. Ross ; with contributions by Susan Perry. Hans J. Eysenck ; with contributions by David W. Fulker. G.V. Reklaitis ; with contributions by Daniel R. Schneider. D. Zissos ; with contributions by J.C. Bathory.