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(Original text: According to the uploader, the image came from one of these two books (both are in the public domain):

• Neuhaus, Eugen, The San Diego Garden Fair: Personal Impressions of the Architecture, Sculpture, Horticulture, Color Scheme, & Other Aesthetic Aspects of the Panama-Pacific International Exposition, Paul Elder and Company, Publishers, San Francisco 1915

or

• Neuhaus, Eugen, The Art of the Exposition, Paul Elder and Company, Publishers, San Francisco 1915)