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Schurz, Carl: Speeches, Correspondence, and Political Papers, selected and edited by Frederic Bancroft. 6 vols. G.P. Putnam's Sons, New York and London, 1913.

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Seligman, Herbert J.: The Negro Faces America. Harper Bros., New York, 1920.

Shaler, Nathaniel Southgate: The Neighbor: the Natural History of Human Contacts. Houghton, Mifflin Co., Boston, 1904.

Siebert, Wilbur H.: The Underground Railroad from Slavery to Freedom. The Macmillan Co., New York, 1898.

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Smith, Justin H.: The War with Mexico. 2 vols. The Macmillan Co., New York, 1919.