Statistics for occurrence #1 of “Mrs. Rose O'Neal” in chapter 1.2, page 31 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.:

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Mrs. Rose O'Neal Greenhow, a zealous and trusted friend of the Confederacy, lived in Washington at the opening of the war. It was she who, on July 16, 1861, sent the famous cipher message to Beauregard, Order issued ...
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