- Types of Hydropower Turbines.
- PREFACE
- Patented April 1, 1873.
- Pacific Saw Manufacturing Company advertisement.
- MYERS, A., FIRM, SAN FRANCISCO, CALIF. ILLUSTRATED DESCRIPTIVE CATALOG.
- LEFFEL'S IMPROVED DOUBLE TURBINE WATER WHEEL.
- ILLUSTRATED DESCRIPTIVE PAMPHLET OF LEFFEL'S DOUBLE TURBINE WATER WHEEL.
- An A. W. Woodward Company letter from 1887.
- A vintage machine shop manufacturing history project about the hydro-electric power plant Industry.
- A vintage hydroelectric power history project.
- A James Leffel Water Wheel Company letter from 1870.
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