EXPLANATORY NOTE The most recent data for milk levels in New York City and Mandan, North Dakota, are not available for this report. This was caused by the loss of the group of samples during analysis. Additional material is presently being analyzed and results will be given in our next report. Since the preparation of this report additional information has been made available by the U. S. Public Health Service. The results of their milk analyses for October, November, and December are given in the table below, Strontium-90 in Milk - Micromicrocuriesper liter October Atlanta, Georgia November December 10.4 8.8 10.2 Austin, Texas Sel 407 26 Chicago, Illinois 6.0 Bely 720 Cincinnati, Ohio 8.6 15.2 9.6 Fargo, North Dakota 1520 11.5 12.3 New York, New York 95 8.8 79 Sacramento, California 1.4 6.1 hee Salt Lake City, Utah el 502 6.1 Spokane, Washington 8.6 11.9 8.6 St. Louis, Missouri 12.2 20.1 15.6 - iii -