On Great Fields: The Life and Unlikely Heroism of Joshua Lawrence Chamberlain

Grant

A. Lincoln: A Biography

The Man Who Saved the Union: Ulysses Grant in War and Peace

Lincoln in Private: What His Most Personal Reflections Tell Us About Our Greatest President

This Republic of Suffering: Death and the American Civil War (National Book Award Finalist)

Lincoln's Greatest Speech: The Second Inaugural

Narrative of the Life of Frederick Douglass: An American Slave

The Eloquent President: A Portrait of Lincoln Through His Words

Personal Memoirs of Ulysses S. Grant: Volumes One and Two

Truman

Team of Rivals: The Political Genius of Abraham Lincoln

Twelve Years a Slave

John Adams

Crazy Horse and Custer: The Parallel Lives of Two American Warriors

The Rise of Theodore Roosevelt

The Flags of the Confederacy

Killing Lincoln: The Shocking Assassination that Changed America Forever

The Demon of Unrest: A Saga of Hubris, Heartbreak, and Heroism at the Dawn of the Civil War