Anglo-American relations 1 Art and Artists--Pennsylvania--Philadelphia--19th Century 1 Artists--Correspondence 1 Franco-American relations 1 International trade--19th century 1 Museums--Philadelphia--19th century 1 Naturalists--United States--Correspondence 1 more ... Ornithology--19th century 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 Tariffs--Law and legislation 1 United States Exploring Expedition (1838-1842) 1 less ...