- Woodward Governor Company advertisement history.
- Woodward Governor Company advertisement history.
- Woodward Governor Company advertisement history.
- Woodward Governor Company advertisement history.
- Woodward Governor Company advertisement history.
- Woodward Governor Company advertisement history.
- The Curtiss Proportional Electric Governor Control System Manual
- Marquette Hydraulic Governor Operation Manual.
- Marquette Hydraulic Governor History.
- Gillespie's Rotary Hydraulic Governor History.
- BRAD'S AIRCRAFT PROPELLER PROJECT.
- Bosh fuel pump. 6
- Bosh fuel pump. 4
- Bosh fuel pump. 3
- Bosh fuel pump. 2