A vintage Keystone stereographic library set titled Tour of the World, containing cards in book-like folios. Volumes 1-2, 5-6. Circa the 1930s. Go with a footed stereoscope viewer. The large collection of photographs offers a unique review of The World in the decades of the 1900s to the 1930s from Rio De Janeiro to Canada, the Philippines to Paris France. Invaluable historical graphic documents predating the World War II.