- Rest in peace James Leffel.
- James Leffel's tombstone showing his patented turbine water wheel.
- James Leffel's tombstone.
- James Leffel's tombstone.
- The Volcan Street Hydo Plant.
- Wisconsin Hydroelectric Power History.
- The Volcan Street Hydo Plant.
- The Volcan Street Hydo Plant showing the original James Leffel turbine water wheel.
- Wisconsin Hydroelectric Power History.
- Wisconsin Hydroelectric Power History.
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- The Volcan Street Hydo Plant History.
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- The Volcan Street Hydo Plant.
- James Leffel & Company history saved one page at a time.