Spouses--Correspondence--19th century 2 Antietam, Battle of, Md., 1862 1 Appomattox Campaign, 1865 1 Armed Forces--African American troops 1 Art and Artists--Pennsylvania--Philadelphia--19th century 1 Artists--Pennsylvania--Philadelphia 1 Chinese Americans 1 more ... Gettysburg, Battle of, Gettysburg, Pa., 1863 1 Hydrographic surveying--Mississippi River 1 Military Order of the Loyal Legion of the United States 1 Military participation--African American 1 Nez Perce Indians--Wars, 1877 1 Seminole War, 2nd, 1835-1842 1 Sioux nation 1 United States--History--Civil War, 1861-1865 1 United States--History--Civil War, 1861-1865--Personal narratives 1 United States--History--Civil War, 1861-1865--Philadelphia (Pa.) 1 United States--History--Civil War, 1861-1865--Political commentary 1 United States. Army of the Potomac 1 United States. Army. Corps of Engineers 1 United States. Army. Corps of Engineers--History--19th century 1 United States. Army. Pennsylvania Infantry Regiment, 33rd (1861-1864) 1 less ...