ppc Sr294/G Ca pLititiipit tt tt itil te ee ee JIASONDIJEFMAMJJASONDIVFMAMJJASONDIVFMAMJJASONDIVEMAMG J 1954 1955 1956 1957 1958 puc Sr9YG Ca Fig. 9— Monthly Sr®® levels in New York City liquid milk. ELE EEV ETE TEEPE EI 1 AMJJASOND]JV FMAMJJASONDIVFMAMJJASONO|LUFMAMJJASOND 1954 1955 1956 1957 Fig. 10— Monthly Srlevels in Perry, N. Y., powdered milk. 38