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Images: Congressional Hearing: Crime of Lynching (1948), Letter from Abraham Lincoln to John M. Clay (1862), Pvt. Droop has missed the war! (1944), Indian Claims: The Skookum Democratic Club to Levi Maish (1894) & US Senate Report: Care and treatment of persons afflicted with leprosy (1916)
These are collections of official papers digitized by the Library of Congress in order of presidency. Also see the American Presidency Project, Public Papers of the Presidents of the United States and Founders Online.