Charles S. Slichter -... en.wikipedia.org

Charles Sumner - Wikipedia en.wikipedia.org

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Charles Sumner |... www.britannica.com

Slichter, Charles Sumner... www.wisconsinhistory.org

The Great Abolitionist:... www.stephenpuleo.com

Charles Sumner – The West... thewestendmuseum.org

Charles Sumner Slichter :... discover.bklynlibrary.org