Public domain
Portrait of Brig. Gen. (as of Mar. 13, 1865) Thomas Eckert, officer of the Federal Army
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit linePortrait of Brig. Gen. (as of Mar. 13, 1865) Thomas Eckert, officer of the Federal Army. 1860. Brady'S National Photographic Portrait Galleries. Civil War Glass Negatives, Library of Congress. Public domain.