- The last generation(1995) schematic drawing of the Woodward Governor Company's Turbine Water Wheel Governor system.
- The last generation(1995) schematic drawing of the Woodward Governor Company's Turbine Water Wheel Governor system.
- Irl C. Martin's Notes On The Old Woodward Governor Company's Water Wheel Governor Numbering System.
- Irl C. Martin's Notes On The Old Woodward Governor Company's Water Wheel Governor Numbering System.