Following is a continuation of the list of titles and authors: Ethylene Oxide Treatment of Naturally Contaminated Materials. By H. Hess, L. Geller, and X. Buehlmann. Aerospace Research. By John H. Brewer. Synergistic Inactivation of Biological Systems by Thermoradiation. By H. D. Sivinski, D. M. Gorst, M. C. Reynolds, C. A. Trauth, Jr. , R. E. Trujillo and W. J. Whitfield. Sterilization Technology in the United States Space Program. By Lawrence B. Hall. Monitoring for Microbial Flora. By Martin S. Favero.