Diplomatic Relations--Sweden--19th century 1 Hydrographic surveying--Mississippi River 1 Pennsylvania Militia--39th Regiment 1 Pennsylvania Volunteers--25th Regiment 1 Seminole War, 2nd, 1835-1842 1 Spouses--Correspondence--19th century 1 United States Navy--Civil War, 1861-1865--Mississippi Squadron 1 more ... United States. Army of the Potomac 1 United States. Army. Corps of Engineers 1 United States. Army. Corps of Engineers--History--19th century 1 William H. Seward 1 less ...