Checked it out on amazon
1. Sheridan: A History of the American Light Tank
2. Armored Car: A History of American Wheeled Combat Vehicles
3. Half-Track: A History of American Semi-Tracked Vehicles
4. Bradley: A History of American Fighting and Support Vehicles
5. Abrams: A History of the American Main Battle Tank
6. Pershing
7. Firepower: A History of the American Heavy Tank
8. Sherman: A History of the American Medium Tank
9. Stuart: A History of the American Light Tank
So Harris98 was right and your Patton makes 10
Check here ....
http://www.booku.com/authors/h/R_P_Hunnicutt.htmAbrams is listed at $70 and firepower at $40