- The Madison Guide Book of History.
- The Madison Guide Book of History.
- loc.ark 13960 t9b56w07h-seq 6
- The second Wisconsin State Capitol in Madison, Wisconsin.
- From the Oldwoodward.com archives.
- Elmer Woodward's first airplane propeller engine governor.
- Airplane governor history in the making!
- WOODWARD MANUAL NUMBER 33178C
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