Armed Forces--African American troops 1 Art and Artists--Pennsylvania--Philadelphia--19th century 1 Artists--Pennsylvania--Philadelphia 1 Hydrographic surveying--Mississippi River 1 Military participation--African American 1 Seminole War, 2nd, 1835-1842 1 Spouses--Correspondence--19th century 1 more ... 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 ...