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The Nuttall Encyclopedia
In the Roman calendar the ninth day before the Ides (q. v .), being the 7th of March, May, July, and October, and the 5th of the rest.
Wood, James, ed. Entry for 'Nones'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/n/nones.html. Frederick Warne & Co Ltd. London. 1900.