For sale is the book What We Saw at Madame World's Fair Being a Series of Letters from the Twins at the Panama-pacific International Exposition to their Cousins at Home by Elizabeth Gordon with drawings by Bertha Corbett published by Samual Levinson in 1915.  This scarce title is illustrated with tipped-in color photographs and black and white drawings.

The Panama–Pacific International Exposition was a world's fair held in San Francisco, California, United States, from February 20 to December 4, 1915. Its stated purpose was to celebrate the completion of the Panama Canal, but it was widely seen in the city as an opportunity to showcase its recovery from the 1906 earthquake.

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