The item is a small novelty souvenir viewbook from the Panama-Pacific International Exposition. It opens up to display fifteen attached, folded halftone photographic views of the San Francisco area. The exposition was a world's fair held in San Francisco for nine months in 1915. The official reason for it was to commemorate the completion of the Panama Canal. It also furnished a platform to showcase a revitalized San Francisco that had been devastated by the Great Earthquake and Fire of 1906.