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- PREFACE
- ILLUSTRATED DESCRIPTIVE PAMPHLET OF LEFFEL'S DOUBLE TURBINE WATER WHEEL.
- Pacific Saw Manufacturing Company advertisement.
- LEFFEL'S IMPROVED DOUBLE TURBINE WATER WHEEL.
- An A. W. Woodward Company letter from 1887.
- A James Leffel Water Wheel Company letter from 1870.
- A vintage hydroelectric power history project.
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