- The James Leffel Company letter, circa November 13,1918.
- Mann Edge Tool Company letter, circa May 8, 1919.
- Woodward blueprint for Man Edge Tool Company, circa 1918. 2.
- Woodward blueprint for Man Edge Tool Company, circa 1918.
- PRIME MOVER CONTROL HISTORY SAVED.
- Woodward Governor Company history.
- Woodward Hydro Product History. 4.
- A James Leffel & Company letter to the Woodward Governor Company in 1919.
- 8-xx
- Woodward Governor Company Actuator Governors. 2.
- 9
- Woodward Water Wheel Governor Catalogue. Page 8.
- Woodward Shop Order 3444, circa March 26, 1919.
- The Elmer Woodward Compensating Water Wheel Governor.
- Woodward Governor Company Actuator Governors.