Introduction Quarterly summary reports are prepared by the Health and Safety Laboratory (HASL) with the objective of presenting a current picture of the Strontium Program. With these reports, it is hoped that investigators actively interested in the program will be better able to relate their own work to that of others. Thus we urge other investigators to send recent results of their work to the Health and Safety Laboratory for publication in succeeding summaries. No attempt is made to interpret the data in these reports. This report also up-dates HASL-\2, "Environmental Contamination from Weapon Tests", in particular Part 1 - "Fallout Monitoring and Documentation". The data presented herein are routinely reported by the Analytical Branch of the Health and Safety Laboratory and four contractor laboratories - Nuclear Science and Engineering Corporation, Isotopes, Incorporated, Radiochemistry, Incorporated, and Tracerlab, Incorporated. appears. In this issue U. S. Naval Research Laboratory data also Omission of one phase of the program in a given quarterly period indicates that insufficient information has accrued to justify its inclusion in a given issue. Please note that data presented in these summaries are subject to revision and that changes in format may occur because of the dynamic nature of the program.