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- 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
- WATER POWER ENGINEERING HISTORY
- The James Leffel & Company's factory history.
- The James Leffel & Company's factory history.
- The James Leffel & Company's factory history.
- The Samson Turbine Water Wheel history on the world wide web.
- PREFACE
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