[by] Herbert E. Dougall with the assistance of Jack E. Gaumnitz. Bernard Kolman, with the assistance of David R. Hill. U. Tietze, Ch. Schenk, with the assistance of E. Schmid. Ron Larson, Robert P. Hostetler with the assistance of David E. Heyd. Beverly Hong ; with the assistance of Zhu Bingyao. John L. Craft with the assistance of Lawrence R. Askling. Kathleen Stassen Berger with the assistance of Ross A. Thompson.