Artists--Correspondence Art and Artists--Pennsylvania--Philadelphia--19th Century 1 Art and artists--Pennsylvania--Philadelphia 1 Art--Pennsylvania--Philadelphia--Exhibitions 1 Clubs and Associations--Philadelphia--20th century 1 Museums--Philadelphia--19th century 1 Naturalists--United States--Correspondence 1 more ... Ornithology--19th century 1 Prints--Technique--20th century 1 United States Exploring Expedition (1838-1842) 1 less ...