Spouses--Correspondence--19th century 2 United States--History--Revolution, 1775-1783 2 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 Korean War, 1950-1953 1 more ... Medicine 1 Mexican War, 1846-1848--Campaigns--Maps 1 Quakers--Pennsylvania--18th century 1 Spouses--Correspondence--18th century 1 Spouses--Correspondence-–20th century 1 Topographical surveying--United States 1 United States. Army of the Potomac 1 United States. Army. Corps of Engineers--History--19th century 1 World War, 1939-1945 1 less ...