• The Highwaymen, Gary Monroe 2001 (I own this)
• Harold Newton, by his sister, Rosetta Humphries 2004
• The Buckner Brothers, by Ellis Jr, 2004
• The Highwaymen, Bob Beatty, 2006 softcover 2006
• The Highwaymen, Beatty, expanded Hardcover edition, 2006
• Harold Newton, Monroe 2007
• Al Black's Prison Murals, Monroe 2009
• The Highwaymen, Catherine Enns, 2009

You could say there are actually nine if you count the Ft Lauderdale Museum's publication of Highwaymen, Newton and Hair which kicked off their exhibit in 2006.

We won't count the Backus books, three of those plus a high quality exhibition catalog. He's not a highwayman, despite what some folks tell me at shows.