[edited by] Robert Cohen. [edited by] Robert B. Hunt. [edited by] Robert W. Rand. [edited by] Robert M. Reece. [edited by] Robert A. Brymer. [edited by] Peter Woll. [edited by] Robert L. Glass. [edited by Robert V. Hogg]. [edited by] Robert A. Corbitt. [edited by] Robert W. Kistner.