Public domain
Dr. Herrald R. Cox with flasks of typhus vaccine obtained from eggs according to the method which he developed. USPHS (United States Public Health Service) Rocky Mountain Laboratory, Hamilton, Montana
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDr. Herrald R. Cox with flasks of typhus vaccine obtained from eggs according to the method which he developed. USPHS (United States Public Health Service) Rocky Mountain Laboratory, Hamilton, Montan. 1942-01-01. Vachon, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.