Public domain
Using acetylene torch to remove tops of eggs under completely sterile conditions. These eggs have been innoculated with yellow fever vaccine virus. 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 lineUsing acetylene torch to remove tops of eggs under completely sterile conditions. These eggs have been innoculated with yellow fever vaccine virus. USPHS (United States Public Health Service) Rocky M. 1942-01-01. Vachon, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.