Public domain
Placing crude typhus vaccine in centrifuging machines. 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 linePlacing crude typhus vaccine in centrifuging machines. 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.