A monograph on the Callahan family descendants of William Thomas Callahan and Nancy Augusta (Speed) Callahan, who lived in Tuscaloosa County, Alabama. William and Nancy had 13 children who were born between 1887 to 1906, and this monograph describes their spouses and children, etc. The research was mostly done by Marguerite Ida (Tarwater) Callahan and Nancy Callahan; the monograph was edited and published in 1986 by Frances Emily (Watkins) Hiestand, in preparation for a Callahan Family Reunion held in 1986.