- The phrase "world class"...
- PMC January 1993.
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- Prime Mover Control January 1993.
- A Woodward Prime Mover Control history project.
- Amos Woodward's first Water Wheel Governor from patent number 103,813, circa 1870.
- The Amos Woodward Governor. Page 3.
- Woodward Governor serial number book , circa 1906.
- Documenting the evolution of the Woodward governor.
- The Amos Woodward Governor.