- Woodward Oil Pressure Relay Valve Governor Manual.
- Woodward Oil Pressure Relay Valve Governor Manual, circa 1912.
- Woodward Oil Pressure Relay Valve Governor Manual Page 3.
- WOODWARD HYDRAULIC GOVERNOR HISTORY.
- Woodward governor data sheet.
- Woodward Governor Company's 1905 catalogue.
- Woodward Governor Company's 1905 catalogue.
- Woodward Governor Company controls in a 1921 S. Morgan Smith Company catalog..
- Woodward Governor Company advertisement history.
- WOODWARD GATE SHAFT TYPE GOVERNOR BULLETIN HISTORY.
- Woodward factory photo of their new relay valve oil pressure governor.
- Woodward drawing from the first oil pressure governor manual
- WATER POWER PLANT HISTORY.
- WATER POWER PLANT HISTORY.
- WATER POWER PLANT HISTORY.