History and Evidence of the Passage of Abraham Lincoln From Harrisburg, Pa., to Washington, D.C., on the 22d and 23d of February, 1861

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Allan Pinkerton, renowned for his Civil War service as head of the Union Intelligence Service, was hired by Lincoln to provide security during his journey to the Nation's capital in 1861. Pinkerton's detailed account is a fascinating look at the methods and practices of the earliest detectives in American history, who relied on ingenuity and quick thinking instead of technology and forensics.