Public domain
Chicago, Illinois. Provident Hospital. Miss Helen A. Butler, supervisor of the operating room. An average of twelve operations take place daily
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineChicago, Illinois. Provident Hospital. Miss Helen A. Butler, supervisor of the operating room. An average of twelve operations take place daily. 1942-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.