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Portrait of American First Lady Florence Kling Harding (1860 - 1924), early 20th century. (Photo by PhotoQuest/Getty Images)

Portrait of American First Lady Florence Kling Harding (1860 - 1924), early 20th century. (Photo by PhotoQuest/Getty Images)

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Portrait of US President Warren G Harding (1865 - 1923) and First Lady Florence Harding (1860 - 1924) as they stand outdoors, 1920. (Photo by PhotoQuest/Getty Images)

Portrait of US President Warren G Harding (1865 - 1923) and First Lady Florence Harding (1860 - 1924) as they stand outdoors, 1920. (Photo by PhotoQuest/Getty Images)

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Florence Harding (1860 - 1924), the wife of US President Warren G. Harding, circa 1923. (Photo by FPG/Getty Images)

Florence Harding (1860 - 1924), the wife of US President Warren G. Harding, circa 1923. (Photo by FPG/Getty Images)

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First Lady Florence Harding (1860 - 1924), wife of President Warren G. Harding, throws a shovelful of dirt upon a newly planted tree, 1923. (Photo by National Photo Company/Buyenlarge/Getty Images)

First Lady Florence Harding (1860 - 1924), wife of President Warren G. Harding, throws a shovelful of dirt upon a newly planted tree, 1923. (Photo by National Photo Company/Buyenlarge/Getty Images)

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Tinted portrait of American President Warren G. Harding (1865 - 1923) surrounded by his wife Florence Harding and father Dr. Gerorge T. Harding, 1920s. (Photo by Hulton Archive/Getty Images)

Tinted portrait of American President Warren G. Harding (1865 - 1923) surrounded by his wife Florence Harding and father Dr. Gerorge T. Harding, 1920s. (Photo by Hulton Archive/Getty Images)