- Documenting the evolution of the Woodward governor control system.
- The Wisconsin Magazine of History.
- Wisconsin Paper Industry history.
- Wisconsin Paper Industry history.
- THE NASH MOTORS COMPANY.
- The Wissota Hydroelectric Power Project.
- The Wissota Hydroelectric Power Project. 2.
- THE SUNDSTRAND AVIATION COMPANY.
- WORLD'S OLDEST AND LARGEST EXCLUSIVE MANUFACTURER OF HYDRAULIC GOVERNORS FOR PRIME MOVERS.
- The Martin "snow birds" spent their winters living in Arizon for the winters.
- Documenting the evolution of the Woodward governor.
- A Woodward Pratt & Whitney PW-31 aircraft engine governor.
- The Wall of Governors in the old Woodward collection.
- Erl Martin's back yard looking down at the Rock River, circa 1957.
- Exploded view of the engine parts.