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- Vintage Hydroelectric Power Plant history.
- Vintage Hydroelectric Power Plant history.
- The Rockford local heading to Davis Junction
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- From the 1986 Woodward Prime Mover Control Issue.
- From the 1986 Woodward Prime Mover Control Issue.