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Panama Pacific International Exposition in 3D
Dozens of stereographic (three-dimensional) images first published to advertise the 1915 World's Fair in San Francisco, known formally as the Panama Pacific International Exposition. "Viewing the Stereographs" includes instructions for making or purchasing the 3-D lenses required to fully appreciate the special effects. Digitized for the San Francisco Exploratorium from a collection held by librarian Bess Moffitt.
http://www.exploratorium.edu/history/PPIE-3D/

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