This photo is a photograph from the Brady-Handy Collection, which was purchased by the Library of Congress in 1954. According to the Rights and Restrictions Information on these images: Published photographs in this collection were created before 1929 and are therefore in the public domain. It is suggested attribution read as: "Library of Congress, Prints & Photographs Division" followed by the reproduction number.

This image is in the public domain in the United States. In most cases, this means that it was first published prior to January 1, 1929 (see the template documentation for more cases). Other jurisdictions may have other rules, and this image might not be in the public domain outside the United States. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.