Public domain
Filtering human serum used in preparation of yellow fever vaccine. 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 lineFiltering human serum used in preparation of yellow fever vaccine. USPHS (United States Public Health Service) Rocky Mountain Laboratory, Hamilton, Montana. 1942-01-01. Vachon, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.