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- A patent model of Amos Woodward's first governor(patent number 103,813).
- Brad's Water Power History on the world wide web.
- Brad's Water Power History on the world wide web.
- JAMES LEFFEL & COMPANY CATALOGUE.
- JAMES LEFFEL & COMPANY CATALOGUE, CIRCA 1897.
- Circa 1895
- The James Leffel Water Wheel Company history.
- A. W. WOODWARD and the JAMES LEFFEL & COMPANY HISTORY.
- The James Leffel Water Wheel Company history.
- The James Leffel & Company's factory history.
- The James Leffel & Company's book on dam history.
- Leffel Water Wheel Company catalog, circa 1883.
- The James Leffel & Company's factory history.
- JAMES LEFFEL & COMPANY CATALOGUE COVER.
- JAMES LEFFEL & COMPANY CATALOGUE COVER.