""The Real David Harum: The Wise Ways And Droll Sayings Of One Dave Hannum"" is a book written by Arthur T. Vance. It tells the story of a man named Dave Hannum, who was the inspiration for the character of David Harum in the novel of the same name by Edward Noyes Westcott. The book is a collection of anecdotes, stories, and sayings attributed to Hannum, who was a successful businessman and horse trader in upstate New York in the late 19th century...