- The Trump Manufacturing Company letter, circa 1913.
- United States Hydroelectric Power House Market Share for the Woodward Governor Company, circa 1991.
- Woodward size D governor serial number 2761, made in 1915.
- Woodward size D governor for the McCord Company, circa 1917.
- Woodward Governor Company Shop Order 729, circa 1904.
- James Leffel & Company letter from May 6th, 1925.
- James Leffel & Company letter from May 6th, 1925. Page 2.
- James Leffel & Company letter from April 30th, 1925.
- Woodward Governor Company letterhead.
- Woodward Governor Company Shop Order 1010, circa 1905.
- Back in the day when you had to work hard for a living.
- James Leffel & Company letter from April 30th, 1925. Page 2.
- Woodward history from 1995.
- WE LOVE ''THINGS MECHANICAL''.
- Documenting the evolution of the Woodward governor system.