Public domain
District of Columbia. Sergeants of 3d Massachusetts Heavy Artillery, with gun and caisson at Fort Totten
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDistrict of Columbia. Sergeants of 3d Massachusetts Heavy Artillery, with gun and caisson at Fort Totten. 1865. Smith, William Morris. Civil War Glass Negatives, Library of Congress. Public domain.