- Mary Lincoln; Biography of a Marriage.
- I, Elizabeth; a Biography of the Girl Who Married General George Armstrong Custer of "Custer's Last Stand. "
- Lincoln's sons
- I, Ruth: Autobiography of a marriage; the self-told story of the woman who married the great Lincoln scholar, James G. Randall, and through her interest in his work became a Lincoln author herself
- Lincoln's Animal Friends: Incidents About Abraham Lincoln and Animals, Woven into an Intimate Story of His Life