Spouses--Correspondence--19th century 3 Slavery--United States--History 2 United States--History--Revolution, 1775-1783 2 United States. Army of the Potomac 2 United States. Army. Corps of Engineers--History--19th century 2 African Americans--Georgia 1 Banking law--United States--History 1 more ... Compromise of 1850 1 Family life--Pennsylvania--18th century 1 Family life--Pennsylvania--19th century 1 Family life--Pennsylvania--20th century 1 Gettysburg, Battle of, Gettysburg, Pa., 1863 1 Hydrographic surveying--Mississippi River 1 Korean War, 1950-1953 1 Mexican War, 1846-1848 1 Mexican War, 1846-1848--Campaigns--Maps 1 Musical Fund Society of Philadelphia 1 Plantation life 1 Quakers--Pennsylvania--18th century 1 Railroad--Construction 1 Reconstruction (U.S. history, 1865-1877)--Georgia 1 Scott, Dred 1 Seminole War, 2nd, 1835-1842 1 Slavery 1 Slavery--Georgia 1 Slavery--Law and legislation--United States--History 1 Spouses--Correspondence--18th century 1 Spouses--Correspondence-–20th century 1 Supreme Court justices 1 Topographical surveying--United States 1 United States--Latin American relations 1 United States. Army. Corps of Engineers 1 Wilmot proviso 1 World War, 1939-1945 1 less ...