Lincoln's spymaster : Allan Pinkerton, America's first private eye /Author: Seiple, Samantha,
Publisher: New York : Scholastic Press,
Date: 2015. This title can be found in 14 Iowa libraries.
Lincoln's spymaster : Thomas Haines Dudley and the Liverpool network /Author: Milton, David Hepburn.
Publisher: Mechanicsburg, Pa. : Stackpole Books,
Date: c2003. This title can be found in 3 Iowa libraries.
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