ed. by Mars G. Fontana and Roger W, Stachie. ed. by Mars G. Fontana and Roger W. Staehle. ed. by James N. Pitts, Jr. and Robert L. Metcalf. ed. by H. R. Louthan and T. A. Pluse. ed. by Karl W.Boer and John A.Duffie. ed. by Roy M. Pitkin and Frank J. Zlathik.