- The James Leffel gave marker.
- A Vintage Hydroelectric turbine Water Wheel and governor history project.
- The Chief Joseph Dam and Hydroelectic Power Plant equipped with Woodward turbine governor systems.
- The Woodward Cabinet Actuator Governing Equipment is on the right (yellow units)
- THE JAMES LEFFEL WATER WHEELS, Standards, Specials, and Samsons, circa 1895.
- THE James Leffel Standard Specials and Samson WATER WHEELS.
- WORKS OF THE JAMES LEFFEL & COMPANY.
- THE JAMES LEFFEL WATER WHEELS, Standards, Specials, and Samsons.
- SAMSON COMLIMENTS.
- PREFACE.
- WEIR DAM MEASUREMENT.
- Improving a Water Power.
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