- Irl C. Martin's Notes On The Old Woodward Governor Company's Water Wheel Governor Numbering System.
- The last generation schematic drawing of the Woodward Governor Company's Turbine Water Wheel Governor system(gate shaft type).
- A first generation (pre-1920) Woodward hydraulic turbine water wheel governor advertisement in Electrical World magazine.
- Irl C. Martin's Notes On The Old Woodward Governor Company's Water Wheel Governor Numbering System.
- United States Hydroelectric Power House Market Share for the Woodward Governor Company, circa 1991.
- The last generation(1995) schematic drawing of the Woodward Governor Company's Turbine Water Wheel Governor system.
- STATE OF THE ART ENERGY CONTROLS SINCE 1870.