Exhibitions and Fairs - Frederick Law Olmsted National Historic Site (U.S. National Park Service)
Human zoo - Wikipedia
World Expos' history
World Expos' history
Expos of the Past, About & History
Great Books Can Heal Our Divided Campuses - WSJ
Shanghai Expo Sets Record With 73 Million Visitors - The New York Times
World's Fairs: A Global History of Exhibitions
Rich, Famous and Then Forgotten: The Art of Rosa Bonheur - The New York Times
World of Fairs: The Century-of-Progress Expositions: 9780226732374: Rydell, Robert W.: Books
Exhibitions and Fairs - Frederick Law Olmsted National Historic Site (U.S. National Park Service)