Diplomatic and consular service, American 4 History 4 Politics and government 4 Slavery 4 Physicians 2 Anglo-American relations 1 Family life--Pennsylvania--18th century 1 more ... Family life--Pennsylvania--19th century 1 Family life--Pennsylvania--20th century 1 Franco-American relations 1 International trade--19th century 1 Korean War, 1950-1953 1 Lumber trade--Pennsylvania--New Hope 1 Quakers--Pennsylvania--18th century 1 Railroad--Construction 1 Roads--Design and construction 1 Slavery--America--Historiography 1 Slavery--Great Britain--History 1 Slavery--Law and legislation--Great Britain--Colonies 1 Slavery--Law and legislation--United States--History 1 Slavery--United States--History 1 Spouses--Correspondence--18th century 1 Spouses--Correspondence--19th century 1 Spouses--Correspondence-–20th century 1 Tariffs--Law and legislation 1 United States--History--Revolution, 1775-1783 1 World War, 1939-1945 1 less ...