detection and collection techniques, and expanding the techniques where improvements can be obtained. Whenever possible, all close-in calibration data should be correla- ted with identical measurements of samples collected at locations remote from the test site, in order to simulate long-range sample conditions that would be expected from debris collections of a foreign nuclear explosion. Sampling for particulate and gaseous debris in tests of thermonuclear magnitude should be conducted in the stratosphere, in order to obtain representative samples._ - — a ~ eycae Laboratory and processing techniques should be improved and developed to the point where cross contamination between gaseous debris samples is negligible. Certain of the physical studies, i.e., petrographic studies, X-ray diffraction, etc., should be continued to explore possible effects useful for diagnostic studies.