If it actually came from the shot that Richie posted, there are no known copyright restrictions on it.
From their FAQ: "Although the Library of Congress does not grant or deny permission to use photos, the Library knows of no copyright restrictions on the publication, distribution, or re-use of these photos. Privacy rights may apply. For further information see the rights, see the Farm Security Administration/Office of War Information Collection color photographs rights information and the George Grantham Bain Collection rights information."
Check out the LoC's photostream: