Public domain
Portrait of Brig. Gen. John Gibbon, officer of the Federal Army (Maj. Gen. from June 7, 1864)
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit linePortrait of Brig. Gen. John Gibbon, officer of the Federal Army (Maj. Gen. from June 7, 1864). 1860. Brady'S National Photographic Portrait Galleries. Civil War Glass Negatives, Library of Congress. Public domain.