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3. American Public Health Association. Standard Methods for the Examination of Dairy Products. 10th ed. New York, New York. 1953.
4. Anonymous. Tentative Methods for the Determination of Antibiotics in Milk. Mimeo-graphed publication, Food and Drug Administration, Revised August, 1958.
5. Anonymous. Food and Drug Acts on Antibiotics; Dealers Urged to Warn Producers. Milk Industry News, November 8, 1959.