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Parke, Davis and Company, manufacturing chemists, Detroit, Michigan. The weights of white rats, used in the biological testing of vitamins, are checked daily
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineParke, Davis and Company, manufacturing chemists, Detroit, Michigan. The weights of white rats, used in the biological testing of vitamins, are checked daily. 1943-01-01. Siegel, Arthur S.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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