Public domain
The sterility of each batch of vaccine is tested before it leaves the laboratory. Rocky Mountain Laboratory. Hamilton, Montana (USPHS--United States Public Health Service)
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineThe sterility of each batch of vaccine is tested before it leaves the laboratory. Rocky Mountain Laboratory. Hamilton, Montana (USPHS--United States Public Health Service). 1942-01-01. Vachon, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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