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- A Vintage American Machine Shop Manufacturing History Project.
- The James Leffel gave marker.
- 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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