- Woodward Governor Company's patent number 3,251,373.
- PMC blueprint history.
- PMC blueprint history.
- PMC blueprint history.
- Oldwoodward.com blueprint history.
- PMC blueprint history.
- PMC blueprint history.
- PMC blueprint history.
- PMC blueprint history.
- PMC blueprint history.
- PMC blueprint history.
- PMC blueprint history.
- Woodward oil pressure relay valve type HR 2500 turbine water wheel governor installation, circa 1917.
- Woodward propeller governor component maintenance manual 33163 for the
- Woodward operation manual 33048 overspeed governor.