$13 Columbus, Wisconsin and Mandan, North Dakota Five-pound samples of powdered milk have been obtained weekly from milk powdering plants in Columbus, Wisconsin (powdered whole mi lk) and Mandan, North Dakota (powdered buttermilk) and composited on a monthly basis. Table 10 summarizes the data in nyc Sr70/g Cae end 11 graphically illustrate the data. The error term is one standard deviation from the mean of replicate analyses, ~ 63% Figures 10