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Second from left is Daisy Smith Judd, wife of my 1st cousin 3x removed, Orion Mathias Judd. The exhibition celebrated the opening of the Panama Canal.
These ladies sure are dressed to the nines for this outing. Love the hats!
Further information about the Panama-California Exposition:
Balboa Park History - Panama-California Exposition Goes International - chapter 5
San Diego History Center - Exposition postcards and photographs
Wikipedia - Panama-California Exposition