- The Woodward Governor Company's Mill Street factory from 1910 to 1940.
- Quote from the Woodward Governor Company's catalogue M, circa 1930's.
- Elmer Woodward's new oil pressure relay valve water wheel governor from his 1912 patent.
- A Woodward VR(vertical relay) type hydraulic governor from patent number 1,106,434, circa 1912.
- A Woodward VR(vertical relay) type hydraulic water wheel governor on display at the Midway Village Museum in Rockfor, Ill.
- Hydroelectric Power History.
- Hydroelectric Power History.
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