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- Water Wheel Governor ad
- WATER POWER ENGINEERING HISTORY
- The Samson Turbine Water Wheel history on the world wide web.
- The James Leffel factory picture in their catalog.
- The James Leffel & Company's factory history.
- The James Leffel & Company's factory history.
- The James Leffel & Company's factory history.
- STYLE 24 with a Woodward Standard size 2 governor.
- PREFACE
- mdp.39015047630630-seq 59
- mdp.39015047630630-seq 40 RKFD ad
- mdp.39015047630630-seq 39
- JAMES LEFFEL & COMPANY CATALOGUE.
- JAMES LEFFEL & COMPANY CATALOGUE, CIRCA 1897.
- Circa 1895