Hamlin, Charles S. (Charles Sumner), 1861-1938. "Charles S. Hamlin Diaries, Box 1, Volume 1, Reel 1, March 12, 1887-September 1, 1910" in Diaries of Charles S. Hamlin
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https://fraser.stlouisfed.org/title/5194/item/533081, accessed on September 11, 2024.