- Modern Machinery, circa 1899.
- From the history books.
- GENERAL OPERATING INSTRUCTIONS.
- Woodward PMC annual report for 1976.
- The Stevens Point Brewery's Beer Racking Area.
- GAS GENERATORS AND TURBINE ENGINE HISTORY.
- Modern Machinery, circa 1899.
- Woodward PMC annual report for 1973.
- Woodward PMC annual report for 1982.
- WGC PMC CTL MARCH 1990.
- The Woodward Governor Company's Hydro Governor Market Share in 1991.
- 1
- U.S. Hydro market installed governor systems, circa 1991.
- 4
- 2